Domain names, SEO and technology blog – Domeny.ForSale

What Is PHP-FPM and How Does It Work?

Thu, 22 Oct 2026 16:05:58 +0200

In brief: PHP-FPM (FastCGI Process Manager) manages processes that execute PHP code on a server. It works with the web server and manages worker processes that can handle successive requests without starting the interpreter again each time. This helps serve websites efficiently, including those built on WordPress, but does not guarantee faster loading on its own—the application code, database and available resources also matter.

How PHP-FPM handles a page request

When a user opens a page that requires PHP execution, the request first reaches a web server such as Nginx or Apache. The server passes the task to PHP-FPM over FastCGI, a communication protocol between the web server and the process running the application. PHP-FPM assigns the request to a worker process, and the result of executing the code returns to the web server and then to the browser.

What is BIND? DNS server roles explained

Thu, 22 Oct 2026 15:43:53 +0200

In brief: BIND (Berkeley Internet Name Domain) is open-source DNS server software, used primarily on Linux and Unix systems. It can publish domain information or look up DNS answers on behalf of users. It is useful when you need control over your DNS service, but provider-managed DNS is usually enough for a typical website.

What is BIND used for?

DNS (Domain Name System) is the domain naming system: among other things, it lets applications find the IP address associated with a name entered in a browser. It also stores other information, such as a domain’s mail servers and data used to verify services. BIND is one of the programs that run this system, not another name for DNS itself.

What Is REGON?

Thu, 22 Oct 2026 15:29:32 +0200

At a glance: REGON is Poland’s central register of national economy entities, maintained by the President of GUS, Poland’s central statistical office. The term also commonly means the identification number assigned to an entity in that register. It helps identify businesses and other organisations, but it is not a tax number, business licence or guarantee of reliability.

What REGON records

REGON covers more than commercial companies. Its scope includes legal persons, organisational units without legal personality, and individuals conducting business activity, along with local units covered by the register’s rules.

Security Headers: What They Do and Why

Thu, 22 Oct 2026 11:05:07 +0200

In brief: Security Headers are HTTP response headers that tell browsers how to handle a page securely. They help limit unwanted script execution, embedding in frames on other websites, and information disclosure when navigating between sites. They do not replace secure code or updates, but provide an additional layer of protection.

How security headers work

When a browser fetches a page, the server sends its content along with metadata: information describing the response. HTTP headers are part of this metadata. They do not appear in the page text, but the browser can use them to restrict how the resources it receives may be used.

What is CSP? A guide to browser security

Thu, 22 Oct 2026 10:40:00 +0200

In brief: CSP, or Content Security Policy, is a browser security mechanism that lets you specify where a page can load resources from and which code it can execute. It helps limit the impact of XSS, the injection of an attacker’s script into a page. A dedicated directive also protects against embedding the site in unwanted frames. The best approach is to send the policy in a HTTP response header and test it without blocking resources first.

What Is Clickjacking and How Does It Work?

Thu, 22 Oct 2026 08:48:17 +0200

In brief: Clickjacking, also called a UI redress attack, tricks users into clicking an element other than the one they see. An attacker might, for example, place an invisible page containing a button over an apparently harmless game button. Website owners limit these attacks primarily by controlling who can embed their pages, while users can help protect themselves by being cautious about suspicious interactions.

How click hijacking works

A browser can display one page inside another using an iframe element, or embedded frame. This is a normal feature used to display videos or maps, for example. In a clickjacking attack, the attacker uses it to hide the real target of a click beneath or above a specially designed interface.

What is the difference between URL and URI?

Thu, 22 Oct 2026 07:43:18 +0200

In brief: A URI identifies a resource, while a URL also specifies how to access that resource and where it is located. In the traditional classification, every URL is a URI, but not every URI is a URL. You can therefore correctly call a website address either a URL or a URI — in everyday conversation, “URL” will usually be more readily understood.

What does URI mean?

URI stands for Uniform Resource Identifier. A resource can be a web page, an image, a document, an item made available through an API, or even an object that cannot simply be downloaded from the internet.

What Is RCE? How Remote Code Execution Works

Wed, 21 Oct 2026 19:30:32 +0200

In brief: RCE, or Remote Code Execution, means running code remotely on a computer or server. In an attack, an intruder exploits a flaw to make the device carry out their instructions without the owner’s permission. This is a serious threat, but the extent of the damage depends partly on the permissions of the compromised program — RCE does not always mean an immediate takeover of the entire system.

What does remote code execution mean in practice?

Code consists of instructions executed by a computer. You usually run it deliberately, for example by opening a program. In an RCE attack, the instructions come from the attacker, and a vulnerable application executes them in ways it was not designed to.

What Is CVSS? Understanding Severity Scores

Wed, 21 Oct 2026 18:54:03 +0200

In brief: CVSS (Common Vulnerability Scoring System) is an open, international standard for assessing the technical severity of vulnerabilities: security flaws in software and systems. Its score from 0 to 10 helps compare vulnerabilities, but does not, on its own, determine the risk to a particular business. When prioritising fixes, you also need to check factors such as how accessible the affected system is, the importance of the data it processes, and evidence of actual exploitation.

Urgent PHP Updates: How to Proceed Safely

Wed, 21 Oct 2026 14:35:48 +0200

In brief: If security patches have been released for the version of PHP your website uses, plan to apply them urgently. First, identify the PHP version running your site, make a backup and check the site’s compatibility with the update. The details of the advisory identified as published on 20 October 2026 must be confirmed on the official PHP website. Without verifying its contents, it is not possible to reliably identify specific vulnerabilities or the release numbers that fix them.

Mass Assignment: How It Becomes a Security Risk

Wed, 21 Oct 2026 11:20:05 +0200

In brief: Mass Assignment automatically assigns data from an HTTP request to fields in an internal object or database model. It becomes a security vulnerability when the application also allows changes to fields that users should not control—for example, the administrator role. Protection primarily involves explicitly specifying allowed fields and checking permissions on the server.

How automatic field assignment works

A web application receives data sent by the browser, for example when saving a profile. An HTTP request—a message sent to the server—may contain a username, an email address and other values. The server then needs to assign them to the appropriate fields in its code.

What Is Path Traversal and How Does It Work?

Wed, 21 Oct 2026 10:28:35 +0200

In brief: Path Traversal is a security vulnerability that lets an application access files outside the directory intended for handling a given request. It is most often associated with reading files without authorization, but functions that write or delete files may also allow those files to be changed or removed. The problem arises when an application treats user input as part of a file path without effectively checking where that path leads.

What is IDOR? Why access checks matter

Tue, 20 Oct 2026 09:26:58 +0200

In brief: IDOR (Insecure Direct Object Reference) is a vulnerability that lets someone access another user’s resource by supplying its identifier, without proper permission checks. For example, a user changes the invoice number in a URL and sees another customer’s document. The problem is not the number in the URL itself, but the server’s failure to check whether that person is entitled to access the invoice.

How IDOR works — a simple example

Imagine a customer portal where you log in to download your own invoice. Your browser sends the server a request for the path /invoices/481, and the application returns document number 481.

What is SSRF and how can you reduce the risk?

Tue, 20 Oct 2026 08:59:01 +0200

In brief: SSRF (Server-Side Request Forgery) is a vulnerability that lets an attacker trick an application server into sending a request to an unintended address. This can allow the server to reach resources that are not directly accessible from the internet, such as services on an internal network. Unlike CSRF, which exploits the user’s browser, SSRF involves the server itself making the request.

How SSRF works — a simple example

Imagine an application that lets you add a product photo by pasting an image address. The user supplies a URL, the address of a resource, and the server downloads the file and saves it in the shop’s catalogue. This is a convenient feature, but the application must check where it is actually connecting.

What is CORS? How browser access works

Tue, 20 Oct 2026 08:44:19 +0200

In brief: CORS (Cross-Origin Resource Sharing) is a mechanism that lets a server allow a browser to make a response available to a script running on a different origin. The server’s response headers specify permission, and the browser enforces it. A CORS error therefore usually means a problem with permission to read the response, not necessarily a failure to connect to the server.

Why browsers restrict cross-origin access

Browsers enforce the same-origin policy. This limits a script’s ability to read data from another origin. It prevents a page open in one tab from freely fetching and reading private data from other services where the user is logged in.

What Is CSRF and How Can You Prevent It?

Mon, 19 Oct 2026 20:16:08 +0200

In brief: CSRF is an attack in which another website tricks a logged-in user’s browser into sending an unwanted request to a different service. If that service checks only whether the user is logged in, it may perform an operation without their informed consent. Protection rests on application-side safeguards: CSRF tokens, appropriate cookie settings and checks on where requests originate.

How CSRF works: an online store admin panel example

CSRF stands for Cross-Site Request Forgery. The attack exploits the fact that a browser can automatically attach a session cookie to requests sent to a particular service. This cookie lets the server recognise a logged-in user without asking for their password again.

What is XSS and how can you prevent it?

Mon, 19 Oct 2026 10:00:06 +0200

In brief: XSS (Cross-Site Scripting) is a vulnerability that causes a browser to run untrusted code in the context of the website being visited. It most often arises when an application treats user input as part of a page or as code rather than plain text. Protection is primarily about displaying data safely, not just blocking suspicious input.

How XSS works and what an attacker can do

The browser interprets HTML as the page structure and JavaScript as instructions to execute. If an application inserts unvalidated content into a location interpreted as code, an attacker can affect how the page behaves for another user. That content might come from a comment, a URL parameter, a profile name or a response from an external service.

SQL Injection: How It Works and How to Fix It

Sun, 18 Oct 2026 21:13:41 +0200

In brief: SQL Injection is a vulnerability that allows specially crafted input to change what a database query does. It primarily arises when an application concatenates SQL commands with user-supplied text. The main defense is parameterized queries, which keep the command separate from its data.

How user input becomes a command

SQL is a language used to read and modify data in relational databases. An application can use it to look up an account, retrieve an order or save a customer’s new address. SQL Injection occurs when input is treated as part of the syntax of a SQL command.

Who Can Register a .pl Domain?

Sun, 18 Oct 2026 07:13:51 +0200

At a glance: .pl is Poland’s country-code domain, but registration is not limited to Polish citizens or organisations based in Poland. Under NASK’s registration framework, individuals and organisations abroad can register a .pl domain through a registrar without Polish citizenship, residence or a registered office in Poland. The requested name must be available for registration, and the applicant must meet the applicable registration terms.

Who is eligible to register a .pl domain?

Both individuals and organisations can register a .pl domain. You do not need to run a business, hold Polish citizenship or establish a company in Poland simply to use this extension.

What Is a Parcel Locker?

Sat, 17 Oct 2026 15:07:06 +0200

At a glance: A parcel locker is a bank of secure compartments where you can collect or send packages without meeting a courier. In Poland, the word paczkomat commonly refers to a locker operated by inpost, a Polish parcel-delivery company whose locker network also operates in other European countries. You usually collect a parcel using the access method provided in your delivery notification, such as a collection code or an app.

What Is Xubuntu and Who Is It Best For?

Sat, 17 Oct 2026 13:20:13 +0200

In brief: Xubuntu is an official Ubuntu flavour featuring Xfce, a desktop environment valued for its low resource requirements and traditional desktop layout. It can work well on an older computer and as a programming system, but it cannot overcome the limitations of a weak processor, limited memory or a worn-out drive. Before installing it, it is best to boot the system from a USB drive and check that your hardware and required applications work.

What is Ubuntu? Uses and compatibility

Sat, 17 Oct 2026 13:05:22 +0200

In brief: Ubuntu is a free operating system based on Linux, available in editions for personal computers and servers, among others. Ubuntu Desktop has a graphical desktop that lets you use the computer without knowing terminal commands. It can replace Windows for many everyday tasks, but you should check compatibility with the software and hardware you need before installing it. Ubuntu is not immune to every threat, although a separate antivirus program is usually not the main line of defence on a home computer.

What Is a 302 Redirect and How Does It Work?

Sat, 17 Oct 2026 08:48:28 +0200

In brief: A 302 redirect is a server response indicating that the requested page is temporarily available at another address. It can direct a domain to its sale listing without declaring a permanent move of the website. However, it does not guarantee that rankings in Google or the full value of existing links will be preserved. Before buying, you need to assess the domain’s history and current state separately.

How does a 302 redirect work?

When you enter a web address, your browser sends a request to the server. Instead of returning content, the server may return HTTP status code 302: a response status in the protocol used for communication on the internet. The Location header then specifies the address the browser should go to.

What is ETS and how does it affect costs?

Sat, 17 Oct 2026 00:37:55 +0200

In brief: ETS is an emissions trading system that puts a price on greenhouse gas emissions in the European Union and gradually reduces the total amount permitted. It aims to encourage businesses to cut emissions, including by saving energy and changing technologies. It raises the cost of emissions-intensive activities, but saying that it simply “restricts production and slows the economy” overlooks differences between industries and how the system’s revenues are used.

What is Shopify and how does it work?

Fri, 16 Oct 2026 14:20:27 +0200

In brief: Shopify is a subscription-based platform for building and running an online store. It provides hosting, a product management dashboard and order management tools, but you still need to prepare your product range and organise sales yourself. You can connect your own domain to the store, including one bought from another provider. Alternatives include WooCommerce, PrestaShop, Shoper and IdoSell.

How Shopify works and what your subscription includes

Shopify uses the SaaS model, meaning software delivered over the internet as a service. Instead of installing a store on your own server, you create an account and use a dashboard in your browser. The provider maintains the platform’s infrastructure and updates its core software.

What is FSD and how does it actually work?

Fri, 16 Oct 2026 08:19:26 +0200

In brief: FSD, short for Full Self-Driving, is a package of Tesla driver-assistance features. FSD (Supervised) requires active driver supervision and does not relieve the driver of responsibility. The USA and Canada are examples of markets where the system has been made available, but they should not be treated as a complete, up-to-date list. Availability in Poland or any other country must be confirmed through official Tesla information and for the specific vehicle: being able to buy the package does not prove that all its features are active.

What Is InPost?

Thu, 15 Oct 2026 14:52:23 +0200

At a glance: InPost is a Polish-founded logistics company best known for automated parcel lockers, where customers can collect and send parcels. It also provides courier and parcel-point services, with availability depending on the country. Its main convenience is that a parcel can wait at a collection location rather than requiring you to be home for a delivery.

What InPost does

InPost transports parcels for online retailers, businesses and individual customers. It operates in Poland and other European markets, although its services, local brands and delivery options are not identical everywhere.

What Is Allegro?

Thu, 15 Oct 2026 14:40:37 +0200

At a glance: Allegro is a major online shopping platform in Central and Eastern Europe, particularly Poland, where it is one of the leading e-commerce marketplaces. It brings together millions of product offers from many sellers rather than operating simply as one large online shop. Like Amazon, it lets shoppers search, compare and order products in one place, but the seller, delivery terms and available services can differ between offers and countries.

What is YubiKey and how does it work?

Thu, 15 Oct 2026 11:33:52 +0200

In brief: YubiKey is a small hardware security key made by Yubico, used to authenticate logins to accounts and services. When used with FIDO2 or U2F, it protects against phishing more effectively than codes you type in, because it checks that authentication is tied to the correct website. You do not need two keys, but a spare significantly reduces the risk of losing access if your primary key is lost or damaged.

What is a .com domain, and who is it for?

Thu, 15 Oct 2026 08:58:21 +0200

In brief: A .com domain is an internet address ending in .com, an extension used worldwide and historically associated with commercial activity. You can register one for a business, blog or personal project — neither the name nor the website content has to be in English. Choose the language of your address to suit your audience and brand, not the extension itself.

What does the .com extension mean?

.com is a top-level domain: the last part of a domain name. In the address example.com, example is the chosen name and .com is the extension. The abbreviation comes from the English word “commercial”, but it no longer means that the address must host a business or shop.

Internet Bots: How They Work and Influence Us

Wed, 14 Oct 2026 08:56:41 +0200

In brief: An internet bot is a program that automatically performs tasks online, such as publishing posts or replying to messages. On social media, bots can be used to spread opinions, propaganda and false information on a large scale, and to create the appearance of widespread support. However, not every suspicious account is a bot, and detecting automation does not prove who controls it—particularly whether a foreign intelligence service is behind it.

What Is the G20, and What Does It Do?

Tue, 13 Oct 2026 16:27:59 +0200

In brief: The G20 is a forum for cooperation among the world’s largest and other major economies, not a ranking of the twenty richest countries. It brings together 19 countries, the European Union and the African Union. An invitation for Poland to attend G20 meetings does not in itself mean admission to the group: participation as a guest must be distinguished from permanent membership.

What is the G20, and why does its name still contain “20”?

The G20, or Group of Twenty, helps its members agree on positions concerning the global economy. It was established in 1999 as a forum for finance ministers and central bank governors. Since 2008, it has also held leaders’ summits: meetings of heads of state or government.

How to Buy a Domain Name Step by Step

Tue, 13 Oct 2026 16:07:08 +0200

In brief: Choose a domain using our search tool, open its listing on aftermarket and create an account. Depending on the listing, you can buy it at the asking price, try negotiating or bid at auction. Once you have paid and the domain has been transferred, you become its registrant—the person or company entitled to use the address—and can connect it to a website or email service.

Choose a domain and check its listing

A domain is an internet address that can be used for a website or email. Buying the domain alone does not mean buying a website, email accounts or hosting, the service that provides space for your website’s files. You need to order these separately unless the listing explicitly includes more.

AWS pay-as-you-go: billing and spending limits

Mon, 12 Oct 2026 16:03:38 +0200

In brief: AWS pay-as-you-go means paying for the services you use rather than buying a fixed package of resources upfront. The standard paid model has no universal spending cap that automatically stops all AWS services for the rest of the month once you exceed it. AWS Budgets helps you monitor spending and trigger selected actions, but it does not guarantee that your bill will stay within a set amount.

How pay-as-you-go billing works

Pay-as-you-go means paying for what you use. The billing unit depends on the service: it might be the time a resource runs, the amount of data stored, the number of requests, or data transfer. There is no single rate for the entire AWS account.

What is thermal imaging? A guide for homes

Mon, 12 Oct 2026 11:11:46 +0200

In brief: Thermal imaging examines surface temperature patterns using a camera that detects infrared radiation. In a home, it helps identify areas that may indicate heat loss, gaps in insulation or air leaks. However, it does not directly reveal the inside of walls or measure total energy losses on its own. The image must be assessed in light of the building’s construction and the survey conditions.

How does thermal imaging of a building work?

Surfaces emit infrared radiation, which a thermal imaging camera uses to estimate their temperature. It displays the result as a thermogram: an image in which colours represent different temperature ranges. The camera cannot see through a wall; it shows the temperature of the surface exposed to it.

What is WebMCP and how does it work?

Mon, 12 Oct 2026 05:39:17 +0200

In brief: WebMCP is a browser interface under development that lets a website expose its functions as tools for AI agents. Instead of guessing which button to click, an agent can use a described operation, such as searching for a product or filling in a form. It is not an AI model or a way to guarantee a site’s visibility in search engines. Before deploying it, check the current status of the specification and browser support.

What is Jenkins? CI/CD and self-hosting

Sun, 11 Oct 2026 20:16:58 +0200

In brief: Jenkins is an open-source automation server that helps development teams build, test and deploy applications. It is most commonly used for CI/CD processes: regularly checking code changes and preparing new versions for release. You can run it on your own server with Linux, but you then take responsibility for maintenance, updates and security.

What Jenkins does—and what it does not do

Jenkins runs tasks according to a defined sequence: it fetches code, runs commands, saves results and reports success or failure. A task can start after a change in the repository, on a schedule or at a user’s request. A repository stores code along with its change history.

What is RAID0? Speed, risks and setup

Sun, 11 Oct 2026 09:41:14 +0200

In brief: RAID0 combines at least two disks into a single storage space and distributes data across them, which can increase read and write speeds. However, it offers no fault tolerance: losing one disk usually means losing access to the entire array. In Linux, you can create a software RAID0 array using mdadm, but this setup is best reserved for data you can recreate or that is protected by a separate backup.

What is netstat and how do you use it?

Sun, 11 Oct 2026 07:42:39 +0200

In brief: netstat is a command-line tool that displays network connections, ports where programs wait for traffic, and other network information. On Linux, it is usually available in the net-tools package: the sudo netstat -tulnp command shows TCP and UDP ports and their associated processes. sudo netstat -tnp is useful for checking established TCP connections, and ss is a modern alternative.

What does netstat show, and when is it useful?

netstat lets you check which addresses your computer communicates with and which programs provide network services. For example, it can help you determine whether a web server is running, why an application cannot bind to a port, or which process is maintaining a connection to another device.

What is MTR? Network testing explained

Sat, 10 Oct 2026 06:55:35 +0200

In brief: MTR, short for My Traceroute, is a network diagnostic tool that combines packet route tracing with repeated measurements of latency and missing responses. On Linux, it helps determine whether a connection problem starts in the local network or further along the route to the server. The key rule when interpreting results: a single router failing to respond does not necessarily mean it is dropping traffic bound for the destination.

What is NIP? Poland’s tax ID explained

Thu, 08 Oct 2026 14:31:09 +0200

In brief: NIP, short for Numer Identyfikacji Podatkowej (Tax Identification Number), is a ten-digit number used to identify taxpayers in Poland. It is used primarily by business owners, legal entities and other entities subject to specific tax obligations. An individual who does not run a business and is not a registered VAT taxpayer usually uses PESEL rather than NIP.

What is NIP used for, and what does it look like?

NIP links tax settlements and documents to a particular person or entity. It appears in tax returns, business registration documents and invoices, among other places, when the rules require the parties to be identified using this number.

Can a Domain Transfer Be Prohibited?

Thu, 08 Oct 2026 13:12:53 +0200

In brief: Yes, a domain transfer can be temporarily blocked or prohibited, but the reason should be grounded in the rules for its extension, the domain’s status or legal restrictions. Not every registrar’s refusal is justified, and the rules for .com do not automatically apply to .pl. First establish whether you mean changing registrars, changing the registrant or moving a website—these are different operations.

What does a domain transfer mean?

A domain transfer usually means changing registrars: the company that handles the domain’s registration and renewals. A registry, by contrast, is the organisation that manages an entire extension, such as NASK for .pl. The registrant is the person or entity entitled to use the domain under the terms of the agreement.

WHOIS: How to Check Domain Information

Wed, 07 Oct 2026 06:52:46 +0200

In brief: You can check domain information using a public WHOIS or RDAP lookup tool by entering just the domain name, not the address of a specific page. You will usually find information about the registrar, domain status, name servers and selected dates, but you will not always identify the registrant. For domains such as .com, RDAP is now the primary method for providing registration data; for .pl, the best starting point is the NASK lookup tool.

What Is the Catch with Cheap Registration of a New Domain?

Tue, 06 Oct 2026 09:20:44 +0200

In brief: The catch with cheap domain registration usually lies not in the purchase price, but in the renewal cost after the first year or in the promotional terms. A low price does not mean it is a scam, but it does not tell you how much you will pay to keep the address either. Before buying, check the renewal price, any additional services in your basket, and the rules for transferring the domain to another provider.

What is a QR code?

Tue, 06 Oct 2026 09:16:43 +0200

In brief: A QR code is a two-dimensional code that stores information in a pattern of light and dark squares. Scanning it with a phone lets you read, for example, a website address, contact details or plain text. Reading the code itself does not require internet access, but a connection is usually needed to open the website whose address it contains.

How does a QR code work, and what can it contain?

QR stands for Quick Response. Unlike a traditional barcode, which consists of parallel bars, a QR code stores data in two dimensions. This allows it to hold more information in a small area.

Dockerfile: building images for containers

Tue, 06 Oct 2026 09:12:47 +0200

In brief: A Dockerfile is a text file containing instructions that Docker uses to build an application image—a package containing the application’s code, required tools and settings. You can use this image to run containers: isolated processes with a prepared environment. A Dockerfile therefore describes how to prepare an application to run, but is not itself a running container.

Dockerfile, image and container—three different things

Think of a Dockerfile as a recipe, an image as the package prepared from that recipe, and a container as a running instance of that package. One image can be used to create multiple containers, such as several instances of the same application.

What Is CPK?

Tue, 06 Oct 2026 09:09:23 +0200

At a glance: In Polish public discussion, CPK usually means Centralny Port Komunikacyjny, commonly translated as the Central Transport Hub: a project combining a new airport with rail and road connections. Its central airport is planned in the Baranów area between Warsaw and Łódź. CPK is a development programme, not an airport passengers can currently book flights from; schedules, costs and the precise scope need checking against current official information.

What is XML? How to read and use XML files

Tue, 06 Oct 2026 09:06:37 +0200

In brief: XML is a text format for storing and exchanging data, with tags that describe the meaning and structure of the information. Its uses include system integrations, configuration files and sitemaps. You can read an XML file in a text editor, but using it correctly requires an understanding of the rules adopted by the particular system.

How XML works and what its name means

XML stands for Extensible Markup Language. A tag is a label enclosed in angle brackets, such as <price>. It identifies what the value between the tags means.

What is kubectl and how do you use it?

Mon, 05 Oct 2026 19:44:04 +0200

In brief: kubectl is a command-line tool for working with Kubernetes — a system that manages applications running in containers. It lets you check application status, deploy changes, read logs and manage cluster resources. It is not Kubernetes itself, nor does it automatically create an environment for running applications: it needs access to an existing cluster.

How kubectl works with Kubernetes

A Kubernetes cluster is an environment made up of machines, called nodes, and components that manage the running of applications. A container packages an application together with its dependencies. Kubernetes runs containers in units called Pods; a Pod can contain one or more containers that work together.

What is Helm? Kubernetes deployments explained

Mon, 05 Oct 2026 19:40:20 +0200

In brief: Helm is a package manager for Kubernetes: a tool that makes it easier to install, configure and update applications in a cluster. Instead of managing many separate files describing an application, you use a package called a chart and supply your own settings. Helm also helps track successive deployments, but it does not replace Kubernetes or guarantee that an update will be safe.

What problem does Helm solve?

Kubernetes is a system for running and managing applications in containers. A cluster, an environment made up of machines managed by Kubernetes, needs a description of what it should run. This description is usually written in manifests: YAML files defining resources, such as a Deployment that manages application instances or a Service that provides access to them.

What Is PLN?

Mon, 05 Oct 2026 19:36:40 +0200

At a glance: PLN is the international currency code for the Polish zloty, Poland’s official currency. One zloty is divided into 100 groszy. When a price is shown as 100 PLN, it means 100 Polish zlotys—not euros or dollars.

What PLN means

PLN identifies the Polish zloty under ISO 4217, the international standard for currency codes. These three-letter codes help banks, payment services and online stores distinguish currencies without relying on potentially ambiguous symbols.

What is BLIK?

Mon, 05 Oct 2026 19:26:12 +0200

In brief: BLIK is a payment system available in the apps of banks that support it. Among other things, it lets you pay in shops and online, withdraw cash from ATMs and send transfers to a phone number. When paying with a code, you enter six digits, then check the details and approve the transaction in your banking app.

How does BLIK work, and what do you need?

BLIK is not a separate account or an app you need to install. You use it within your bank’s app, and for a typical payment, the money is taken from the linked account. You need an account with a bank that supports BLIK, an active mobile banking app and internet access for transactions that require communication with the bank.

What is a .pl domain?

Mon, 05 Oct 2026 18:37:34 +0200

At a glance: .pl is Poland’s country-code top-level domain: the ending in web addresses such as example.pl. It is a natural choice for a website aimed at people in Poland, but it does not prove that its owner is Polish or that the website is trustworthy. Registering a .pl domain gives you the right to use that address for a renewable period; hosting and email services are separate.

What .pl means in a web address

A top-level domain, or TLD, is the final part of a domain name, such as .com, .org or .pl. A country-code top-level domain, often shortened to ccTLD, is associated with a country or territory. In this case, .pl identifies Poland.

What Is Index Cardinality?

Mon, 05 Oct 2026 10:12:26 +0200

In brief: Index cardinality is the number of distinct key values stored in an index, often reported by the database as an estimate. It helps the optimizer assess how many rows may match a query condition and whether using the index is worthwhile. High cardinality generally helps when looking up specific records, but does not guarantee faster performance on its own.

What index cardinality actually means

An index is an additional data structure that makes it easier to find rows without scanning the entire table. Its key consists of the value of one column or a set of values from several columns. Cardinality describes how many distinct keys of this kind occur in the data, not the total number of entries in the index.

What is Google Workspace?

Mon, 05 Oct 2026 10:02:22 +0200

In brief: Google Workspace is a suite of Google services for email, working with documents, storing files and communication, managed by an organisation. It lets you use a business email address on your own domain, such as anna (at) twojafirma.pl, and edit documents collaboratively online. Its main difference from a regular Google account is centralised management of users, access and security settings; the range of features depends on the plan you choose.

What is Microsoft Edge?

Mon, 05 Oct 2026 08:09:12 +0200

In brief: Microsoft Edge is Microsoft’s web browser — a program for opening websites, using webmail, watching videos and working with online applications. It comes standard with Windows, but you can also use it on other supported computers and mobile devices. It is not a search engine, nor are you required to use it: you can use it alongside Chrome, Firefox or Safari.

What is Microsoft Edge used for?

In Edge, you enter a website address or a search query in the bar at the top of the window. When you enter an address, the browser opens that particular website; when you enter a question, it sends it to your selected search engine. It also lets you open multiple pages in separate tabs, save favourites and download files.

What is Docker Compose?

Mon, 05 Oct 2026 08:06:28 +0200

In brief: Docker Compose is a tool for defining and running applications made up of several Docker containers. In a single file, you describe the services, their configuration, connections and data storage, then start them with the command docker compose up. It is useful, for example, when a project needs an application, a database and an additional administration panel.

How Docker Compose works with Docker

Docker runs programs in containers: isolated environments containing an application and the dependencies it needs. A container is created from an image—a ready-made package that specifies what should be run. Compose does not replace Docker: it uses Docker to manage a set of related containers.

What is Docker Hub and how do you use it?

Mon, 05 Oct 2026 08:03:42 +0200

In brief: Docker Hub is an online registry of container images: a place to download ready-made packages for running applications and publish your own. Its users include developers who need a web server, database or test environment without manually installing every component. Docker Hub stores images, but does not run your application itself—the container runtime on your computer or server does that.

Images, containers and Docker Hub—what is the difference?

A container image is a package containing an application, the libraries it needs and its startup configuration. A container is a running instance of that image: it has its own processes and an isolated environment, but usually shares the host’s operating system kernel. One image can be used to create multiple containers.

What is Lynx?

Sun, 04 Oct 2026 16:02:52 +0200

In brief: Lynx is a text-based web browser used in a terminal, mainly via the keyboard. It displays text and links instead of a graphical page layout, but it does not support JavaScript, so many modern web applications do not work in it. It is useful for reading simple pages, working on a server and checking what remains of a website without its visual layer. In English, “lynx” also refers to the wild cat; in a technology context, it usually means the browser.

What is Firefox?

Sun, 04 Oct 2026 15:46:14 +0200

In brief: Firefox is a free web browser developed by Mozilla for opening websites and using online services. It is an alternative to Chrome, Edge or Safari, offering features including tracking protection, extensions and data synchronisation across devices. It is not a search engine — but it lets you use Google, Bing and other search engines.

What is Firefox used for, and how does it differ from a search engine?

A browser is a program that retrieves and displays web pages. In Firefox, you can read the news, watch videos, use online banking, shop or work in web-based applications. The official spelling of the name is “Firefox”, not “FireFox”.

What is curl?

Sun, 04 Oct 2026 15:37:15 +0200

In brief: curl is a command-line tool for transferring data between a computer and a server. Among other things, it lets you download a file, check a website’s response and send data to an API, an interface that enables communication between programs. It works without a graphical browser, making it useful for diagnostics and automation.

What is curl used for, and how does it differ from a browser?

You run curl in a terminal: enter a command, an address and optional parameters that specify how it should behave. The tool supports various communication protocols, including HTTP and HTTPS, which websites use. In practice, it is often used to check web services and work with APIs.

What is Google Chrome?

Sun, 04 Oct 2026 15:34:58 +0200

In brief: Google Chrome is a free web browser from Google: a program for opening websites and using online services. It works on computers, phones and tablets. It is not the same as Google Search, and you do not need a Google account for ordinary web browsing.

What is Google Chrome used for?

Chrome displays websites and lets you do various things on them: read the news, shop, watch videos or use online banking. It can also run web applications, which are tools that work in a browser, such as email, a document editor or a messaging app.

What Is Chromium?

Sun, 04 Oct 2026 15:31:30 +0200

In brief: Chromium is an open-source web browser project whose code forms the basis of Google Chrome, Microsoft Edge and many other browsers. The name also refers to a browser built from that code, similar in appearance to Chrome but not necessarily equipped with the same services and update mechanisms. For everyday internet use, the installation source and regular security patches matter more than the name itself.

Chromium is both a project and a browser

Chromium is an open-source project, meaning its source code can be viewed, analysed and used under its licences. It is developed by a community with substantial involvement from Google. Other companies can use it as a foundation for their own browsers, adding an interface, features and services.

What Is Brave?

Sun, 04 Oct 2026 15:13:13 +0200

In brief: Brave is a free web browser that blocks many ads and user-tracking mechanisms by default. It is based on Chromium, the same project used by Google Chrome, so it supports many of the same extensions. It may be a good choice if you want to reduce tracking without installing extra tools, but it does not provide complete anonymity.

How does Brave work, and what does it have in common with Chrome?

A browser is a program you use to open websites, use online applications and download files. Brave serves the same purpose as Chrome, Firefox or Safari. It is available for computers and mobile devices, although the range of features may vary between operating systems.

What are cookies?

Sun, 04 Oct 2026 10:20:07 +0200

In brief: Cookies are small pieces of data stored by your browser at the request of the website you visit. They help keep you logged in and remember settings or shopping basket contents, but they can also be used to analyse visits and track activity for advertising purposes. Not all cookies require consent — what matters is their actual purpose, not their name.

How do cookies work?

When you open a website, its server may ask your browser to store a cookie containing a name and a value, such as a session identifier. A session links a user’s successive actions while using a website. With subsequent requests to the relevant server, the browser sends matching cookies, allowing the website to recognise that the visit is continuing.

What Is FreeBSD?

Sat, 03 Oct 2026 11:21:13 +0200

In brief: FreeBSD is a free Unix-like operating system developed as a coherent whole: the kernel, core tools and documentation. The project is supported by the FreeBSD Foundation but led by a community of developers. FreeBSD has strong foundations for networking applications, but claiming that its network stack is always better than Linux’s is too broad — the outcome depends on the hardware, configuration and type of traffic.

How does FreeBSD differ from Linux?

FreeBSD comes from the BSD family, or Berkeley Software Distribution, historically associated with Unix development at the University of California, Berkeley. The term “Unix-like system” refers to a similar operating model: users and permissions, a hierarchical file system, processes and tools that can be combined in scripts. It does not automatically imply formal certification under the UNIX brand.

What is ARD? Resource discovery for AI

Sat, 03 Oct 2026 10:41:18 +0200

ARD (Agentic Resource Discovery) is an open specification for describing and finding resources that AI agents can use. It helps an application find a tool, an MCP server, another agent or a set of instructions suited to the user’s task. It connects resource descriptions published by their owners with registries that index them and provide search. This article is based on the ARD specification .

What problem does ARD solve?

Suppose you ask an assistant: “Find a short domain name for a bicycle shop.” To complete the task, it needs access to a domain catalogue and instructions on how to search it. In a small application, a developer can connect the appropriate tool in advance. With thousands of services available, manually configuring each integration and including every description in the model’s context becomes difficult.

ai-catalog.json: Resource Discovery for AI

Sat, 03 Oct 2026 10:39:36 +0200

In brief: /.well-known/ai-catalog.json is an earlier path for publishing a resource manifest for AI agents, described as the predecessor to /.well-known/ard.json in the Agentic Resource Discovery (ARD) specification. This kind of manifest describes available tools, agents or instructions for using them in a structured JSON format. New implementations should use the ard.json path and an HTML link with rel="ard".

This article is based on the ARD v0.91 specification , dated 26 August 2026 and marked as a Proposal. The documentation was checked on 3 October 2026.

What Is Gmail?

Sat, 03 Oct 2026 10:15:09 +0200

In brief: Gmail is Google’s email service, which lets you send, receive and organise messages through a browser or an app. Its basic version is free to use and gives you an address ending in @gmail.com. Gmail is part of a Google Account, but it is not the same as the entire account — it is one of the services available within it.

How does Gmail work, and what is it used for?

Gmail, sometimes written as “GMail”, is used for email correspondence: keeping in touch with friends, receiving purchase confirmations, sending documents or exchanging work-related messages. You can write to someone who uses another email provider; the recipient does not need to have Gmail.

What Is Punycode?

Sat, 03 Oct 2026 10:11:02 +0200

In brief: Punycode is a way of representing Unicode characters, such as the Polish letters “ł” or “ó”, using basic ASCII characters. In domain names, it represents an address containing local letters in a technical form recognisable by the xn-- prefix. For example, bücher.de takes the form xn--bcher-kva.de — these are two representations of the same domain, not two separate addresses to register.

Why do domains need Punycode?

Unicode is a standard covering characters from many languages and alphabets. ASCII is a much smaller character set: it includes basic Latin letters, digits and the hyphen, among other characters, but does not include “ą”, “ę” or “ż”. The traditional representation of hostnames used on the internet relies on this limited set.

What Is ASCII?

Sat, 03 Oct 2026 10:08:57 +0200

In brief: ASCII is a standard that assigns numbers from 0 to 127 to 128 characters, allowing text to be stored and transmitted as data. It includes English letters, digits, punctuation marks and control codes, but does not include Polish letters such as “ą” or “ł”. Modern text is usually stored in UTF-8, which remains compatible with ASCII for those first 128 characters.

How ASCII works and what its name means

ASCII stands for American Standard Code for Information Interchange. It is a character encoding: an established rule for mapping characters to numerical values. A computer stores numbers as bits, and a program reading the text interprets them according to the selected encoding.

What is a router?

Sat, 03 Oct 2026 07:45:23 +0200

In brief: A router is a device that forwards data between networks, for example between your home network and the internet. It lets a computer, phone and TV share a single internet connection. A home router usually also provides Wi-Fi, but a router and Wi-Fi are not the same thing, and the device itself does not replace an internet access service.

How does a router work in a home network?

Data travels over a network in small units called packets. A router reads their destination addresses and decides where to forward them. An IP address is an identifier used to address a device or its connection to a network.

What is Apache?

Fri, 02 Oct 2026 20:09:55 +0200

In brief: Apache HTTP Server is free web server software that receives browser requests and sends back page content, files or application responses. It can serve simple HTML pages, run WordPress sites in conjunction with PHP and forward traffic to other applications. Apache is neither a domain name nor hosting — it is one of the programs that can run on a hosting server.

What is Apache used for, and how does it work?

A web server is a program that handles communication over HTTP or HTTPS, the protocols used to transfer web pages. The word “server” can also mean a computer, but Apache is software, not a device. The Apache HTTP Server project is developed under the Apache Software Foundation and is open source.

What Is the Go Programming Language?

Fri, 02 Oct 2026 20:04:38 +0200

In brief: Go is a general-purpose programming language created at Google and developed as an open-source project. It is most commonly used to build server-side services, command-line tools and infrastructure software. It combines relatively simple syntax, compilation to machine code and built-in concurrency mechanisms, which organise multiple tasks whose execution can overlap in time.

How does Go differ from other languages?

The language’s official name is Go, although you will also encounter the term “Golang” in search engines and conversations. It does not refer to a different version or a separate technology. Go is also unrelated to the board game of the same name.

What is Nginx?

Fri, 02 Oct 2026 12:19:15 +0200

In brief: Nginx is server software that receives requests from browsers and delivers website files or forwards traffic to an application. It can also handle encrypted HTTPS connections, distribute traffic across servers and cache copies of responses. On managed hosting, the provider usually handles it; on your own server, configuring it may be your responsibility.

What role does Nginx play when you open a website?

Nginx, pronounced “engine-x”, is primarily an HTTP server, a program that handles the communication used to retrieve web pages. It should not be confused with a physical server or a virtual machine: Nginx runs on such a computer alongside other programs.

What is a .si domain?

Fri, 02 Oct 2026 10:45:24 +0200

In brief: The .si domain is the country-code internet extension assigned to Slovenia. It is primarily suited to websites aimed at Slovenian audiences, such as local businesses, shops and branches of foreign brands. It should not be confused with .sk, Slovakia’s extension; .si alone does not confirm the location or trustworthiness of a website’s owner.

What does the .si extension mean?

.si is a country-code top-level domain, abbreviated as ccTLD. It is the ending of an address assigned to a particular country or territory — just as .pl is assigned to Poland and .de to Germany. In the address przyklad.si, “przyklad” is the chosen name, while “.si” indicates the Slovenian domain namespace.

What Is GCP?

Fri, 02 Oct 2026 10:04:52 +0200

In brief: GCP, or Google Cloud Platform, is Google’s cloud services platform: it provides computing power, databases, file storage, and analytics and artificial intelligence tools over the internet. Instead of buying your own servers, you provision the resources you need on Google’s infrastructure and pay according to the terms of your chosen services. GCP offers more capabilities than typical website hosting, but also requires greater control over configuration, security and costs.

What is Azure?

Fri, 02 Oct 2026 10:03:30 +0200

In brief: Microsoft Azure is a cloud platform that lets you access servers, databases, file storage and services for building applications and AI solutions over the internet. Instead of buying and maintaining your own hardware, you deploy the resources you need on Microsoft’s infrastructure and pay according to the terms of your chosen service. Azure works well for many business and software development projects, but for a simple company website, ordinary hosting will often be easier to manage.

What is AWS?

Fri, 02 Oct 2026 10:02:10 +0200

In brief: AWS, or Amazon Web Services, is Amazon’s cloud platform, providing servers, file storage, databases and more over the internet. Instead of buying your own hardware, you provision the resources you need and pay according to each service’s pricing rules, often based on usage. AWS offers considerable flexibility, but requires cost control and security configuration — it is not simply hosting with a higher storage limit.

How does the AWS cloud work?

Cloud computing means using a provider’s IT resources over a network. The hardware is located in AWS data centres, and customers manage their chosen services through a console, developer tools or code that defines the infrastructure. For example, they can launch a server for testing and then delete it.

What is Kubernetes (K8s)?

Fri, 02 Oct 2026 10:00:20 +0200

In brief: Kubernetes, or K8s for short, is an open platform for running and managing applications in containers. It ensures that the specified number of copies are running, replaces unavailable instances, and makes deploying new versions easier. It is useful for complex systems, but for a simple website or small application, maintaining it can be more complicated than the hosting itself.

From containers to application management

A container is an isolated environment for running an application process. It is created from a container image: a package containing the code, required libraries, and startup settings. This allows the same version of an application to run in different compatible environments without manually installing all its dependencies.

What Is CBD?

Fri, 02 Oct 2026 06:38:38 +0200

In brief: CBD, or cannabidiol, is one of the compounds found in cannabis. It does not cause the intoxication typically associated with THC, but it can affect how you feel, cause side effects and interact with medicines. Its best-established medical use involves purified CBD in medicines used for specific epilepsy syndromes — this does not mean that shop-bought CBD oil effectively treats insomnia, pain or anxiety.

How does CBD differ from THC and hemp oil?

CBD belongs to the cannabinoids, a group of substances that affect the body’s signalling systems. The body produces its own cannabinoids, and some compounds derived from cannabis can influence processes related to pain perception, appetite and mood, among other things. However, this mechanism alone does not prove that a particular preparation is effective in treating a disease.

What Is a GPU?

Thu, 01 Oct 2026 19:29:54 +0200

In brief: A GPU is a graphics processor: a computing chip designed to perform many similar operations simultaneously. Among other things, it creates images in games and graphics applications, but it is also used for scientific computing and artificial intelligence. It is not the same as an entire graphics card: it can be the card’s main component or part of a processor or larger integrated circuit.

How does a GPU work, and what is it used for?

GPU stands for Graphics Processing Unit. Its strength is parallel processing: instead of performing all calculations in sequence, the chip distributes the work among many computing units. This works well when a task can be divided into a large number of similar operations.

What is a CPU?

Thu, 01 Oct 2026 19:28:39 +0200

In brief: The CPU is a computer’s main processor: it executes program instructions, performs calculations and controls the flow of many tasks. Its performance affects how quickly applications run, among other things, but the overall performance of the device also depends on RAM, storage and the graphics processor. When choosing a processor, comparing core counts or clock speeds is not enough — its design and intended use also matter.

What does CPU stand for, and what does it do?

CPU stands for Central Processing Unit. In discussions about computers, it is usually simply called the processor. Similar units also operate in smartphones, tablets and servers, although they may be part of a larger integrated circuit.

What Is a Startup?

Thu, 01 Oct 2026 19:21:02 +0200

In brief: A startup is a young company or team seeking a repeatable and scalable business model under conditions of considerable uncertainty. Simply starting a business recently or creating an app does not make it a startup. The key is to check whether the solution meets a genuine customer need and whether the business can grow without a proportional increase in costs.

What distinguishes a startup

There is no single universally accepted definition of a startup. In business practice, the term most often refers to a venture that is still testing important assumptions: who its customers will be, what they will pay for, how to reach them, and whether sales will be profitable.

What is zsh? Features and getting started

Thu, 01 Oct 2026 18:00:22 +0200

In brief: Zsh, or Z shell, is a system shell — a program that interprets the commands you enter and runs the tasks you specify. It makes terminal work easier through extensive command completion, history and configuration options. It is mainly useful for interactive work with your system, but you do not need to know it to start using a terminal.

Zsh and the terminal — what is the difference?

A terminal is an application that provides a place to enter commands and display results. The shell runs inside that application: it reads commands, parses their syntax and initiates the requested operations. You can run different shells in the same terminal, such as zsh or Bash.

What is Ethereum?

Thu, 01 Oct 2026 17:55:56 +0200

In brief: Ethereum is a public blockchain network that lets users transfer digital assets and run programs called smart contracts. Its native cryptocurrency, ether (ETH), is used, among other things, to pay for operations and secure the network. Ethereum is therefore not just a “digital coin”, but also a platform for applications that operate without a single central operator.

Ethereum and ETH — what is the difference?

Ethereum is the network and the set of rules governing how it operates. Ether (ETH), meanwhile, is an asset used within that network. When someone says they are “buying Ethereum”, they usually mean buying ETH, not shares in a company. Holding ether does not confer shareholder rights or a share in a business’s profits.

What Is Super Intelligence?

Thu, 01 Oct 2026 13:59:41 +0200

In brief: Super Intelligence, or superintelligence, is the concept of intelligence that surpasses the best human experts in nearly all significant cognitive domains. In a technological context, it usually refers to artificial superintelligence, abbreviated as ASI. It is not simply a faster chatbot, and its emergence, timing and operation remain subjects of research and debate.

What does superintelligence mean?

Superintelligence would surpass humans not only in computing speed or the amount of information retained, but also in the quality of its reasoning, planning, scientific discoveries and solutions to new problems. The breadth of these abilities matters: a program that beats humans at one game does not thereby become superintelligent.

What Is SI?

Thu, 01 Oct 2026 13:47:59 +0200

In brief: SI is the Polish abbreviation for “sztuczna inteligencja”, meaning “artificial intelligence” — a term for computer systems that perform tasks such as recognising images, processing language or making predictions based on data. Its English equivalent, AI, means the same thing. AI does not necessarily think or understand the world as a human does, and its results can be wrong. Outside the technology context, SI also stands for the International System of Units, which includes the metre, kilogram and second, among others.

What is domain renewal?

Thu, 01 Oct 2026 09:37:03 +0200

At a glance: Domain renewal extends your right to use an internet address for another period, usually one year. You pay the registrar managing the name. Missing renewal can interrupt your website and email, and the domain may eventually become available to other people.

What are you extending?

A domain is an internet name such as yourbusiness.pl, used for a website and email. Registration does not buy perpetual ownership. As the registrant, you obtain the right to use the name for the paid period under the rules of its extension.

What is robots.txt and how does it work?

Thu, 01 Oct 2026 09:32:15 +0200

In brief: robots.txt is a public text file that tells web crawlers which parts of a website they may fetch and which they should skip. It helps manage how crawlers visit a site, but it does not protect data or guarantee that a URL will be removed from search results. Its rules apply only to crawlers that respect them.

Where is robots.txt located, and how does it work?

The robots.txt file belongs in the website’s root directory, at an address such as https://example.com/robots.txt. A crawler—a program that visits pages automatically—may read it before fetching their content. It uses the rules to determine which paths it may access.

What is IKZE?

Thu, 01 Oct 2026 09:30:29 +0200

In brief: IKZE, short for Indywidualne Konto Zabezpieczenia Emerytalnego (Individual Retirement Security Account), is a voluntary way to save for retirement in Poland that allows you to deduct contributions on your annual tax return. Once the withdrawal conditions are met, the accumulated funds are subject to a flat-rate tax of 10%. IKZE is not a single, specific investment product: its costs, risks and potential returns depend on what is held in the account.

What Is an ETF?

Thu, 01 Oct 2026 09:26:41 +0200

In brief: An ETF is an investment fund whose units are bought and sold on a stock exchange, much like shares. A single purchase can give you exposure to a basket of assets, such as shares in many companies or bonds. An ETF does not guarantee a profit or protect your capital — its risk depends primarily on what it invests in and how it is structured.

How does an ETF work, and what are you actually buying?

ETF stands for Exchange-Traded Fund, meaning a fund traded on a stock exchange. When you buy a unit, you acquire a stake in the fund, rather than directly owning shares in every company in its portfolio. You make the trade through a brokerage account, at the price available on the market at that moment.

What Is Cryptocurrency?

Thu, 01 Oct 2026 09:25:31 +0200

In brief: Cryptocurrency is a digital asset that can be transferred over a computer network, with the authority to spend it secured by cryptography. In many cryptocurrencies, the transaction ledger is maintained by network participants rather than a single bank. Cryptocurrencies can be used for payments, running applications or investing, but they are not equivalent to a safe bank deposit and can lose value sharply.

How does cryptocurrency differ from money in a bank account?

The balance in online banking is a record of the bank’s liability to its customer, expressed, for example, in Polish złoty. A cryptocurrency such as bitcoin, by contrast, exists within a separate system whose rules determine how units are created and transactions approved. You do not have to buy a whole bitcoin — each unit can be divided into smaller parts.

What Is Bitcoin?

Thu, 01 Oct 2026 09:24:20 +0200

In brief: Bitcoin is digital money sent over the internet without a central operator such as a bank. Its network maintains a shared record of transactions, and the currency unit is denoted by the symbol BTC. You can buy it, hold it and use it for payments, but its price fluctuates significantly, and an incorrect transfer usually cannot be reversed.

Bitcoin as a currency and a network

The word “Bitcoin” refers to both the payment network and the cryptocurrency that operates within it: a digital asset whose transfers are secured by cryptography. There are no physical BTC coins or central issuer independently deciding their supply. Software run by network participants checks whether transactions comply with shared rules.

What Is RAID?

Thu, 01 Oct 2026 09:23:10 +0200

In brief: RAID is a way of combining several drives into an array, a shared data storage system. Depending on the level chosen, it can improve performance, allow continued operation after a drive failure or combine these benefits. Not every RAID level protects against failure, and none replaces an independent backup.

How does RAID work, and what is it used for?

RAID stands for Redundant Array of Independent Disks. The operating system usually sees this set of drives as a single logical storage device. Data is distributed across the drives, duplicated or stored alongside information that allows it to be reconstructed.

What is e-TOLL?

Thu, 01 Oct 2026 09:16:47 +0200

In brief: e-TOLL is Poland’s state-operated system for collecting tolls on selected road sections, using vehicle location data. It primarily applies to vehicles and vehicle combinations with a maximum authorised mass exceeding 3.5 tonnes, and to buses regardless of their mass. To use it, you must register the vehicle, ensure that location data is transmitted and arrange payment of tolls. It is not a universal payment system for all Polish motorways.

What is open source?

Wed, 30 Sep 2026 20:12:57 +0200

In brief: Open source is software distributed under a licence that allows you to use it, examine its code, modify it and redistribute it under specified conditions. It does not automatically mean a free service or an absence of restrictions. What you can do with a program is determined by its licence, not simply by the fact that its code has been published online.

What does open source code mean?

Source code is a set of program instructions written in a programming language, readable by people who know that language. Access to it lets you check how an application works, fix a bug or adapt its features to your needs. With closed-source software, users usually receive a finished product without these permissions or full access to the source code.

What Is Root? Accounts, Android and DNS

Wed, 30 Sep 2026 20:11:39 +0200

In brief: Root usually means the account with the highest privileges on Linux and related systems. On Android, “rooting” means gaining administrative access that the manufacturer normally does not provide to users. The word also refers to the root, or top level, of a directory structure or the DNS name hierarchy — so its meaning depends on the context.

Root on Linux: the account with the highest privileges

Root is a special administrator account whose user identifier, or UID, is 0. It can manage accounts, install system software, change settings, and read or modify files that ordinary users cannot access. Its actions may still be subject to additional system security measures or restrictions imposed by its environment, such as a container.

What Is a Nucleon?

Wed, 30 Sep 2026 20:10:36 +0200

In brief: Nucleon is the collective name for protons and neutrons—the particles that make up atomic nuclei. The number of nucleons in a nucleus is the sum of its protons and neutrons, known as the mass number. Electrons are not nucleons.

Protons and neutrons—two types of nucleon

A proton has a positive electric charge, while a neutron is electrically neutral. Their masses are very similar, although a neutron is slightly heavier than a proton. Both particles are about 1800 times heavier than an electron, the negatively charged particle found outside the nucleus in an atom.

What is scp? Secure file copying over SSH

Wed, 30 Sep 2026 13:09:56 +0200

In brief: In computing, SCP (Secure Copy Protocol) is a way to copy files securely between computers, while scp is the command used to transfer them over SSH, an encrypted connection to a remote system. You can use it to upload a file to a server or download a backup to your own computer. Modern versions of scp in OpenSSH use SFTP by default rather than the older SCP protocol. The acronym also appears in the name of the fictional universe SCP Foundation—a separate meaning unrelated to data transfer.

What is rsync? Copy and sync files safely

Wed, 30 Sep 2026 13:08:32 +0200

In brief: rsync is a command-line tool for copying and synchronizing files between directories or computers. On subsequent runs, it skips files it considers unchanged, and during network transfers it can send only the changed portions of data. It is useful for updating copies of data and transferring files to a server, but ordinary synchronization is no substitute for a backup with version history.

How does rsync work, and how does it differ from ordinary copying?

Rsync compares the specified source with the destination and determines which files need to be transferred. By default, it identifies changes primarily by file size and modification time. This means it does not compare the entire contents of every file on each run.

What is ping?

Wed, 30 Sep 2026 13:07:03 +0200

In brief: Ping is a tool for checking whether a device on a network responds and how long it takes for a message to reach it and a reply to return. In everyday usage, “ping” also means the latency itself, measured in milliseconds — the lower it is, the faster the connection responds. Low ping is particularly useful for gaming and live conversations, but it does not automatically mean fast file downloads.

What is csh?

Wed, 30 Sep 2026 13:06:13 +0200

In brief: csh, or C shell, is a system shell: a program that interprets the commands you enter and runs other programs on Unix and related systems. It supports interactive work and script execution, and its syntax partly resembles the C language. You may encounter it in older environments, technical tools and existing scripts; for a new administration script, Bash or sh will usually be more practical.

What is csh used for, and how does it differ from a terminal?

A terminal is a text interface where you enter commands and read their output. A shell runs within this environment: it reads commands, expands shorthand expressions, handles redirections and launches programs. Simply opening a terminal window therefore does not mean you are using csh — it may be running Bash, Zsh or another shell.

What Is a Terminal and How Do You Use It?

Wed, 30 Sep 2026 13:04:26 +0200

In brief: A computer terminal is a tool for interacting with your system mainly by typing commands and reading text output. You can use it to browse files, run programs and manage a server, among other tasks. The word “terminal” has other meanings too: it can refer to a payment device or part of an airport. In computing, however, it usually means a window for working with commands.

How does a computer terminal work?

In a graphical interface, you perform tasks using windows, buttons and menus. In a terminal, you type a command, press Enter and receive output, an error message or a request for more information. Some programs run interactively in the terminal, displaying a text editor or a CPU usage monitor, for example.

What is UDP?

Wed, 30 Sep 2026 13:03:16 +0200

In brief: UDP is a network protocol that transmits small chunks of data without first establishing a connection. It does not itself acknowledge receipt, retransmit lost packets or ensure the correct delivery order. It is useful where up-to-date data and low latency matter more than recovering every missing chunk—for example, in voice calls and online games.

How does UDP work, and what is a datagram?

UDP, or User Datagram Protocol, is a transport-layer protocol: it defines how data is passed between applications over a network. It runs on top of IP, the protocol responsible for addressing and transmitting packets between devices. IP helps reach the correct host, while UDP uses port numbers to direct data to the appropriate service or application.

What Is BGP?

Wed, 30 Sep 2026 13:02:22 +0200

In brief: BGP (Border Gateway Protocol) is a protocol that allows the networks making up the internet to exchange information about available routes to IP addresses. It lets operators choose which networks traffic should pass through according to their policies and agreements, rather than connection speed alone. An error in this information can make an otherwise working website inaccessible to some users.

What role does BGP play on the internet?

The internet consists of many interconnected networks managed by telecommunications operators, hosting companies, universities and cloud providers. The basic unit in BGP routing is an autonomous system (AS): a network or group of networks governed by a common route selection policy. It is identified by an ASN.

What is an .md file?

Tue, 29 Sep 2026 12:08:15 +0200

In brief: An .md file is usually a plain text file written in Markdown — a simple way to mark headings, lists, links and other document elements. You can open it in any text editor, while a program that supports Markdown will also display a formatted version. These files are often used to create instructions, notes, documentation and website content.

What does the .md extension mean?

The .md extension, the ending of a file name, usually indicates Markdown. This is a lightweight markup language: instead of selecting formatting from a toolbar, you type simple symbols into the text. For example, two asterisks on either side of a word indicate bold text.

What is KSeF?

Tue, 29 Sep 2026 12:06:54 +0200

In brief: KSeF, short for Krajowy System e-Faktur (Poland’s National e-Invoicing System), is a state system used to issue, receive and store structured invoices. Such an invoice has a defined data format, rather than merely the appearance of a PDF document. For a business, using KSeF means changing invoice workflows and preparing software, access permissions and procedures; the scope of the obligation must be checked against current legislation and announcements from Poland’s Ministry of Finance.

What is self-storage?

Tue, 29 Sep 2026 12:03:58 +0200

In brief: Self-storage is a service that lets you rent a separate space to store belongings, such as a lockable unit in a building or a container. You usually transport and arrange the items yourself, and access to the unit is subject to the operator’s rules. This solution can be useful during a move or renovation, or when a business needs extra space for stock.

How does self-storage rental work?

You choose the size of the unit, sign a contract and receive a means of access: this could be a key, code, card or app. You rent space for your own use rather than handing over individual items to a shared storage facility. You are generally responsible for loading, transport and arranging your belongings unless you purchase an additional service.

What Is Vending?

Tue, 29 Sep 2026 12:02:53 +0200

In brief: Vending means selling products through machines, without a salesperson’s direct involvement in the transaction. The customer selects an item and pays, and the machine dispenses the purchase or prepares a drink. This is how coffee, snack and hygiene product vending machines work, among others, but the absence of a cashier does not mean that this kind of business requires no servicing.

How does vending work, and what can you sell?

The word “vending” comes from English and, in Polish usage, refers primarily to sales through vending machines. The machine combines displaying the range of products, accepting payment and dispensing the product. It can operate around the clock, provided its location remains accessible to customers.

What Is an LMS?

Tue, 29 Sep 2026 12:00:38 +0200

In brief: An LMS (Learning Management System) is a system for managing learning: making courses available, assigning them to participants and tracking progress. Businesses, schools and training providers, among others, use it to organise materials, assignments and results in one place. An LMS can support online learning and in-person classes, but it does not itself replace a well-prepared course or an instructor.

How does an LMS work in practice?

An LMS usually has three roles: the administrator configures the platform and accounts, the instructor prepares or provides courses, and the participant works through the assigned programme. The exact division of permissions depends on the system. In a small business, one person may both manage the platform and deliver training.

What is a PLC?

Tue, 29 Sep 2026 11:59:35 +0200

In brief: A PLC is a programmable industrial device that reads signals from sensors and buttons, executes a stored program, and controls machinery. For example, it can start a conveyor, open a valve, or maintain the temperature in a tank. It is designed to operate under specified industrial conditions, but its capabilities and resilience depend on the particular model.

What does PLC stand for, and what is it used for?

PLC stands for Programmable Logic Controller. “Programmable” means that operating rules are stored in a program, rather than requiring a new arrangement of electrical connections each time. “Logic” refers to making decisions based on conditions, for example: if the tank is full, switch off the pump.

What Is 3D Printing?

Tue, 29 Sep 2026 11:57:59 +0200

In brief: 3D printing is the production of a physical object from a digital model, usually by building it layer by layer. It allows you to create prototypes, functional parts and decorative objects, but their durability and accuracy depend on the technology, material and design. It is not limited to printing with plastic: resins, metals and other materials requiring specialist equipment are also used.

How does 3D printing work?

3D printing is an additive manufacturing method, meaning that an object is created by adding material. This distinguishes it from subtractive manufacturing, such as milling, in which a tool removes material from a larger block. However, a printer does not always have to lay down a single path of material — some machines cure an entire layer at once.

What is ZFS?

Mon, 28 Sep 2026 19:03:26 +0200

In brief: ZFS is a file system combined with a mechanism for managing disk space. It verifies data integrity, supports snapshots and lets you combine storage devices into storage pools. It is particularly useful for servers and NAS devices, which share files over a network, but it does not replace a backup.

How ZFS works and how it differs from a conventional file system

A file system determines how data is stored and located on a storage device. ZFS also handles functions that other solutions often assign to a separate layer: combining disks, providing data redundancy and allocating space. This gives it direct visibility into both the file structure and where the files are stored.

What is gdrive?

Mon, 28 Sep 2026 19:01:29 +0200

In brief: Gdrive is an informal name for Google Drive — a service for storing files online and sharing them with other people. You can use it through a browser, a mobile app, or a desktop application. Drive makes it easier to access documents from different devices, but file synchronization does not replace an independent backup.

What does gdrive mean, and what is it used for?

Google Drive is a cloud service: files are stored on the provider’s servers, rather than only in your phone’s or computer’s storage. Once you sign in to the correct Google account, you can open them from different devices. Access usually requires an internet connection, although selected files can be prepared for offline use in advance.

What Is RAM?

Mon, 28 Sep 2026 11:18:08 +0200

In brief: RAM is fast working memory in which a computer or phone stores the data needed for the system and applications to run. Its contents disappear when power is disconnected, so it does not replace storage or saving files. More RAM mainly helps when running programs do not fit into the available memory — it does not automatically speed up every task.

How does RAM work?

RAM stands for Random Access Memory. This means that data can be read or written at a selected address without going through preceding data in sequence. In personal computers, RAM usually refers to the working memory used by the system and running programs.

What is a node?

Mon, 28 Sep 2026 11:16:10 +0200

In brief: A node is an element of a network or structure that can connect to other elements. In computing, it can be a device on a network, a participant in a blockchain network or part of a web page document. In programming discussions, “Node” often means Node.js, a JavaScript runtime that operates outside the browser. You can identify the intended meaning by the context in which the word appears.

What is routing?

Mon, 28 Sep 2026 11:14:15 +0200

In brief: Routing is the process of choosing the path that data packets take to reach their destination through interconnected networks. A router checks the destination address and uses stored routes to forward the packet — either to the recipient or to another router. This allows a computer on a home network to communicate with a website’s server, for example.

How does routing work in a computer network?

Data sent over a network is divided into packets: small units containing the content and the information needed to deliver it. An IP packet includes, among other things, a source address and a destination address. An IP address identifies a device’s interface on a network and makes it possible to determine where to direct traffic.

What Is a Firewall?

Mon, 28 Sep 2026 11:08:40 +0200

In brief: A firewall controls connections to and from a device or network, allowing or blocking them according to defined rules. It helps limit unwanted access, but does not replace updates, antivirus software or caution against scams. At home, an active operating system firewall and a properly configured router are usually a sufficient starting point.

How does a firewall work?

Data travels across a network in packets, which are small portions of information. A firewall evaluates these packets and connections against rules. It may consider the sender’s or recipient’s IP address, the direction of traffic, the protocol type and the port — a number identifying the service with which communication is to take place.

What is TCP?

Mon, 28 Sep 2026 11:04:24 +0200

In brief: TCP is a transport protocol: a set of rules for transferring data between applications running on a network. It ensures that data is delivered in the correct order, detects missing data and retransmits lost portions. However, it does not guarantee that every connection will succeed, nor does it encrypt the information being transmitted.

What role does TCP play on the internet?

TCP, short for Transmission Control Protocol, operates between applications and the layer responsible for sending packets across the network. It is used by email, remote login via SSH and many connections to websites, among other things. Thanks to TCP, an application does not have to keep track of the order of data fragments or resend them after they are lost.

What is WSL? Running Linux on Windows

Sun, 27 Sep 2026 20:27:09 +0200

In brief: WSL (Windows Subsystem for Linux) is a feature of Windows that lets you run a Linux environment without installing it as a separate bootable operating system. It gives you access to a Linux terminal, development tools and many applications while you stay in Windows. For most new uses, the best starting point is WSL 2, which uses a real Linux kernel.

How does WSL work, and what does it actually run?

WSL stands for Windows Subsystem for Linux. It lets you install a distribution: a particular version of a Linux environment with its own set of programs and package manager. Ubuntu is a popular example; its package manager lets you install and update programs using commands.

What is llms.txt and when should you use it?

Sun, 27 Sep 2026 20:23:37 +0200

In brief: llms.txt is a proposed text file format that introduces a website and points tools using large language models to its most important resources. It may help them find documentation or other content, but publishing it does not mean that AI assistants will read it. It does not control crawler access, prevent model training or guarantee that the website will be cited in answers.

What is llms.txt for?

An LLM, or large language model, is a model used, among other things, to generate answers in AI assistants. The model itself does not necessarily have internet access: a suitable tool or application retrieves web content for it. The llms.txt file is intended to help these systems find useful information without navigating menus, advertisements and a complex site structure.

What Are Agent Skills?

Sun, 27 Sep 2026 20:17:01 +0200

In brief: Agent Skills are packages of instructions, supporting materials and optional scripts that an AI agent can use for specific tasks. Instead of explaining a company procedure to it every time, you can save that procedure as a skill: a reusable capability. Such a package does not train the model or grant it new permissions by itself—it guides the model on how to carry out the work using the tools available.

What Is MariaDB?

Sun, 27 Sep 2026 17:37:27 +0200

In brief: MariaDB is an open-source relational database management system: software for storing and organising information in related tables. It is used by websites, online shops and applications that need to save data and retrieve it quickly. MariaDB was built from MySQL, but the two projects develop independently, so not every version and feature is interchangeable.

How does MariaDB work, and what does it store?

A relational database organises information in tables with columns and rows. In an online shop, separate tables might contain customers, products and orders. A customer ID stored with an order links the purchase to the right person without repeatedly copying their details.

What Is Agents.md?

Sun, 27 Sep 2026 17:33:49 +0200

In brief: AGENTS.md is a text file containing instructions for AI agents working on a project, most often on code. It describes, among other things, how to run tests, how the project is organised and the rules for making changes. It does not run anything itself: its effect depends on whether the tool being used reads the file and how it interprets the guidance it contains.

What the AGENTS.md file is for

An AI agent is a tool that can not only answer questions but also perform tasks, such as browsing files, editing code and running commands. To do this, it needs context specific to the project. Without that context, it may choose the wrong way to install dependencies or modify files that the team does not edit manually.

What is MongoDB?

Sun, 27 Sep 2026 17:31:46 +0200

In brief: MongoDB is a document database: it stores information in structures resembling JSON objects, rather than organising it exclusively in tables with rows and columns. It is useful, among other things, in applications where data has a nested structure or varying sets of attributes. However, it is not automatically a faster or simpler alternative to SQL databases — the choice depends primarily on how data is written and read.

What is PostgreSQL?

Sun, 27 Sep 2026 17:29:02 +0200

In brief: PostgreSQL is an open-source database management system that stores information and lets applications read and modify it. It works well for online stores, business systems and web services, among other uses, where the integrity of related data matters. It can be used without licence fees, but running and maintaining a database requires resources and administration, or paying for a managed service.

What is PostgreSQL and how does it work?

PostgreSQL, also called Postgres, is an object-relational system. Its foundation is tables: organised sets of rows and columns that can be linked to one another. The “object” part refers, among other things, to the ability to define custom data types; when getting started, however, understanding tables and relationships is the most important thing.

What is MySql and how does it store data?

Sun, 27 Sep 2026 17:27:37 +0200

In brief: MySQL is a relational database management system: software that stores structured information and lets you read and change it. Websites, online shops and applications use it to store things such as posts, user accounts and orders. MySQL is not a programming language: it primarily uses SQL to work with data.

How does MySQL store data?

A relational database organizes information into tables. Each table has columns defining the types of data and rows representing individual records, such as customers. Tables can be linked using identifiers, rather than storing the same information repeatedly.

What Is a Database?

Sun, 27 Sep 2026 17:26:47 +0200

In brief: A database is an organised collection of information that can be searched, added to and updated. Online shops, banks and booking systems, among others, use databases to store information about customers, products or transactions. A database is usually managed by specialised software that also controls access permissions and ensures operations are carried out correctly.

A database and the software that manages it

A database can be compared to a well-organised filing system. Each piece of information has a defined place and format, so there is no need to look through the entire collection to find the entry you need. Unlike a paper filing system, a database also lets you quickly bring information together, for example to display all orders placed by a particular customer.

What Are Tokens?

Sun, 27 Sep 2026 17:25:13 +0200

In brief: A token is a unit whose meaning depends on the context: in artificial intelligence, it is a fragment of processed data; in access systems, it confirms permissions; and in cryptocurrencies, it can represent a digital asset or right. Not every token has a price, and not every token can be bought. To understand which kind of token is involved, you need to check where it appears and what it is used for.

What is a backend?

Sun, 27 Sep 2026 17:19:33 +0200

In brief: The backend is the part of an application that runs on the server: it processes requests, applies the rules governing the service and controls access to data. It is responsible, for example, for checking passwords, saving orders and providing purchase histories. Users usually do not see it directly, but access its functions through a website or mobile application.

Backend vs frontend — what is the difference?

The frontend is the part of an application that users interact with directly: forms, buttons, menus and data views. On a website, it runs primarily in the browser. The backend receives requests sent from the browser and decides what can be done with them.

What Is Frontend?

Sun, 27 Sep 2026 17:16:47 +0200

In brief: Frontend is the part of a website or application that users see and interact with: the content layout, menus, buttons, forms and how they respond to user actions. On the web, it is built primarily using HTML, CSS and JavaScript. Backend, meanwhile, handles what happens behind the scenes, such as checking login credentials and saving orders.

What does frontend include?

Frontend is the interface: the layer that allows users to interact with a system. It includes not only the appearance of the screen but also how its elements behave: opening menus, selecting dates, displaying form errors or updating the contents of a shopping cart without reloading the page.

What is Unix?

Sun, 27 Sep 2026 17:15:37 +0200

In brief: Unix is an operating system developed at Bell Labs whose design became the foundation of an entire family of systems and influenced many others. It was designed to support multiple users and run multiple tasks at the same time. Linux is a Unix-like system, not simply another name for Unix; macOS has Unix foundations, and specific versions and configurations have received UNIX certification.

What is Unix, and where did it come from?

An operating system is software that manages hardware and allows programs to run. It allocates memory and processor time to them, handles files and controls access to resources. This is precisely what Unix does—it is not a programming language or a single application.

What is cron? Scheduling and troubleshooting

Sun, 27 Sep 2026 17:14:22 +0200

In brief: Cron is a mechanism on Unix and Linux systems that automatically runs commands or scripts on a predefined schedule. You can use it to create backups, generate reports or delete old files, for example every day at 2:30. To make a job work correctly, you need to specify not just when it runs, but also the command, permissions and how to check for errors.

How does cron work, and what is it used for?

Cron runs in the background as a system service: it checks the schedule and runs the commands assigned to it. A command scheduled this way is called a cron job, while crontab is the table that stores job schedules.

What Is Crontab?

Sun, 27 Sep 2026 17:11:23 +0200

In brief: Crontab is a table containing a schedule of commands run automatically by the cron service, most commonly on Linux and Unix systems. The name also refers to the command used to manage that table. With crontab, you can, for example, create a backup every day or run a script every few minutes without manually logging in to the server.

What is the difference between cron and crontab?

Cron is a background service that checks the schedule and runs the commands recorded in it at specified times. Crontab is the configuration for that schedule. An entry alone is not enough: the cron service must be installed and running, and the computer or server must be on at the scheduled time.

What is vi?

Sun, 27 Sep 2026 17:08:58 +0200

In brief: vi is a terminal-based text editor used primarily on Unix and Linux systems. It is controlled through keyboard commands, and what the keys do depends on the selected mode. To start typing, press i; to save the file and quit, press Esc, type :wq and press Enter. To quit without saving changes, press Esc, then type :q! and press Enter.

What is vi used for?

vi is used to edit plain text files: program configurations, scripts, source code and notes. It is not a document editor like Word — it is not intended for setting fonts, arranging page layouts or embedding illustrations. It works on the contents of a file, without additional document formatting.

What Is MoltBook?

Sun, 27 Sep 2026 17:07:17 +0200

In brief: MoltBook is a social platform designed for artificial intelligence agents—programs that can publish content and respond to posts by other programs. It resembles a discussion forum, but its main participants are AI systems, while humans primarily observe their activity. Conversations between agents are not evidence of machine consciousness or of their operating entirely independently of humans.

How does MoltBook differ from a regular forum?

On a traditional forum, a person creates an account, writes a message and replies to other users. On MoltBook, an AI agent takes on the role of the participant publishing content. This is a program that uses an artificial intelligence model, instructions and available tools to perform tasks, such as reading discussions and preparing replies.

What is HAProxy?

Sun, 27 Sep 2026 17:06:17 +0200

In brief: HAProxy is software that accepts network traffic and forwards it to selected servers running an application. It acts as a reverse proxy and load balancer: it intermediates connections and distributes traffic across service instances. It helps handle higher loads and bypass failed servers, but deploying HAProxy alone does not guarantee uninterrupted availability.

How HAProxy works between the user and the application

A reverse proxy accepts connections on behalf of application servers. The user connects to the service address backed by HAProxy, rather than directly to a particular backend server. HAProxy selects a destination and forwards traffic there, and the response returns through the same intermediary layer.

What is Bash? Shell basics and a first script

Sun, 27 Sep 2026 11:07:37 +0200

In brief: Bash is a system shell: a program that reads user commands and arranges for them to be executed. It lets you work with files, run programs, and automate repetitive tasks using scripts. It is widely used on Linux and is also available on macOS. On Windows, you can use it through tools such as WSL or Git Bash.

What is Bash used for?

The name Bash stands for Bourne Again SHell, a reference to the earlier Bourne shell and a play on “born again.” Bash is both an interactive tool for issuing commands and a scripting language. A script is a text file containing instructions executed by an interpreter—in this case, Bash.

What Is a Shell?

Sun, 27 Sep 2026 10:54:38 +0200

In brief: A shell is a program that accepts user commands and lets you run programs and perform operations on a computer system. The term most often refers to a text-based shell, such as Bash, Zsh or PowerShell. A shell is not the same as a terminal: the terminal provides a place to enter commands, while the shell interprets them.

What is a system shell used for?

A shell lets you operate a computer using commands rather than clicking buttons and icons. You can use it to browse directories, copy files, launch applications, check running processes or manage a server. The available actions depend on the operating system, installed programs and your account permissions.

What Is Git?

Sun, 27 Sep 2026 10:47:50 +0200

In brief: Git is a distributed version control system: a tool for recording the history of changes to files. It lets you compare versions, restore earlier content and combine several people’s work. It runs locally on your computer; neither GitHub nor an internet connection is needed for basic work.

What is Git used for?

Without version control, it is easy to end up with files named project-final, project-final2 and project-revised. Git replaces these manual copies with an organised history. Each deliberately saved stage can be described, inspected and compared with another.

What Is GitHub?

Sun, 27 Sep 2026 10:44:49 +0200

In brief: GitHub is an online platform for storing projects, tracking changes, and collaborating on code and documentation. It uses Git—a system that records the history of changes to files. You can use GitHub for your own projects, teamwork, or reporting bugs in other people’s software; you do not need to know terminal commands right away.

GitHub and Git—how do they differ?

Git is a version control system, a tool that lets you save successive states of a project, compare changes, and return to earlier versions. It runs locally on your computer and does not require an account with any online service. Instead of creating folders called “project-final” and “project-final-revised”, you save changes along with a description.

What Is GitLab?

Sun, 27 Sep 2026 10:42:48 +0200

In brief: GitLab is a platform for storing code, collaborating on changes and automating application tests and deployments. It uses Git, a system that records the history of changes to files, but adds tools for organising work and controlling quality. You can use the GitLab.com service or run GitLab on your own infrastructure.

What is GitLab used for, and how does it differ from Git?

Git lets you track who changed files and when, compare versions and restore an earlier state of a project. It also works locally on your computer, without an account on any service. GitLab, by contrast, is a platform that provides a shared workspace for people using Git.

What is TTL?

Sat, 26 Sep 2026 21:13:41 +0200

In brief: TTL (Time To Live) is a parameter that determines how long data can remain valid or how long a packet can travel through a network. In domain settings, TTL primarily means how long a DNS response is cached, usually expressed in seconds. A lower value helps changes become visible sooner, but does not guarantee that all users will see them at the same time.

What does TTL mean in DNS?

DNS is a system that allows services associated with a domain name to be located, such as the IP address of a website’s server. This information is stored in records: an A record specifies an IPv4 address, while an MX record specifies the servers that handle email. TTL accompanies this data and indicates how long a cached response can be used without retrieving it from the source again.

What Is Java?

Sat, 26 Sep 2026 13:38:54 +0200

In brief: Java is a programming language and an associated platform for building and running applications. It is used in business systems, web services and Android applications, among other things. Java is not the same as JavaScript, and you usually do not need to install it for ordinary web browsing.

What is Java, and how does a program written in it work?

A programming language lets you write instructions that a computer executes. In Java, a programmer describes, for example, how to calculate the price of an order, save customer data or check product availability. Java is a general-purpose language: it is not limited to a single kind of application.

What is JavaScript?

Sat, 26 Sep 2026 13:37:55 +0200

In brief: JavaScript is a programming language used, among other things, to create interactive websites and web applications. It can respond to clicks, validate forms and update content without reloading the entire page. It runs not only in the browser — with the right environment, it can also be used on a server.

What role does JavaScript play on a website?

The easiest way to understand JavaScript is to compare it with two other web technologies. HTML describes the structure and meaning of content, such as a heading, form or button. CSS handles appearance: colours, spacing, layout and some animations. JavaScript adds logic: instructions that determine what should happen in a particular situation.

What Is CSS?

Sat, 26 Sep 2026 13:36:44 +0200

In brief: CSS is a style sheet language that defines the appearance and layout of web pages: colours, fonts, spacing and the positioning of elements. It works alongside HTML, which describes the structure and meaning of content. With CSS, the same page can have a readable layout on both a phone and a large monitor.

What does CSS control, and how does it differ from HTML?

CSS stands for Cascading Style Sheets. It is a declarative language: you specify the effect you want for an element, and the browser handles displaying it. You do not need to describe step by step how to draw a button or position a paragraph.

What is HTML?

Sat, 26 Sep 2026 13:35:31 +0200

In brief: HTML is a markup language that describes the structure and meaning of web page content. It tells the browser which parts are headings, paragraphs, links, images or forms. It is not a programming language: CSS is primarily used to define a page’s appearance, while JavaScript is often used to add behaviour and interaction.

What is HTML used for on a website?

HTML stands for HyperText Markup Language. “Hypertext” means text connected by links to other documents or sections of content. “Markup” refers to tags written in the code that assign a specific role to each part of a document.

What Is Python?

Sat, 26 Sep 2026 13:34:03 +0200

In brief: Python is a general-purpose programming language: it lets you write instructions that a computer executes to solve a specific task. Its uses include automating work, analysing data, building web applications and machine learning. Its readable syntax makes it a good choice as a first language, although it will not be the best tool for every project.

How does Python work, and what makes its code distinctive?

Python code is text written according to the language’s rules, known as its syntax. To run a program, you need an interpreter — software that reads the code and executes its commands. You can use it on your own computer or in an environment available through a browser.

What is PHP?

Sat, 26 Sep 2026 13:33:00 +0200

In brief: PHP is a programming language used primarily to build server-side websites and web applications. It processes data, executes application rules and prepares the response received by the browser. WordPress and many online stores use it, among others, but you do not need to install PHP on your computer simply to browse these sites.

How does PHP work when you open a page?

PHP is a scripting language: its code is executed by the PHP runtime installed on the server. Its name is a recursive acronym for “PHP: Hypertext Preprocessor”. For users, its role matters more than what the name stands for: PHP can prepare different content at the same address, depending on the data and circumstances.

What Is SPAM?

Sat, 26 Sep 2026 09:26:57 +0200

In brief: Spam consists of unwanted messages, usually sent in bulk, and repetitive content that clutters communication channels. It is most commonly associated with email, but also appears in text messages, messaging apps and comments. Not all spam is fraudulent, but messages from unknown senders may contain attempts to steal information or malicious attachments.

What does spam mean, and where can you encounter it?

A typical example of spam is the same offer sent to thousands of random recipients who did not request it. The content may advertise a real product, lead to a suspicious shop or have no connection to the place where it was posted. Writing the word “SPAM” in capital letters does not change its meaning.

What Is a Newsletter?

Sat, 26 Sep 2026 09:20:06 +0200

In brief: A newsletter is an email sent to people who have signed up to a mailing list, usually regularly and focused on a particular topic. It may contain advice, new articles, company news or sales offers. A good newsletter delivers content that matches the promise made at sign-up and makes it easy to unsubscribe from future messages.

Someone interested in a newsletter enters their email address in a form, for example on a shop, blog or organisation’s website. They join a list of subscribers: people who have signed up to receive messages. The sender prepares the content in an email marketing tool and sends it to the whole list or a selected group.

What is an API?

Fri, 25 Sep 2026 15:55:57 +0200

In brief: An API is a programming interface: a set of rules that allows one program to use another program’s data or functions. For example, it can retrieve a weather forecast for an application, pass an order to a warehouse management system, or request the creation of a shipping label. An API defines which operations are available, how to call them, and how to interpret the result.

How does an API work in practice?

API stands for Application Programming Interface. Here, an interface means a way for software components to communicate, rather than a screen with buttons. A user interacts with an application through a form or menu, while a program can use another system through its API.

What Is a Passkey?

Fri, 25 Sep 2026 15:46:23 +0200

In brief: A passkey is a way to sign in to an account without entering a password. You usually approve the sign-in with a fingerprint, facial recognition or your device’s PIN. A passkey is tied to a specific service, making it much better than a traditional password at protecting against attempts to steal your login details on a fake website.

How does a passkey work, and how is it different from a password?

Creating a passkey generates a pair of cryptographic keys, meaning mathematically related data: a public key and a private key. The service stores the public key, while the private key remains under the control of your device or the provider that stores and synchronises your passkeys. The private part is not sent to the service when you sign in.

What Is 2FA?

Fri, 25 Sep 2026 15:43:34 +0200

In brief: 2FA stands for two-factor authentication: confirming your identity when logging in using two different types of security, such as a password and a code from an app on your phone. This means that stealing your password alone is usually not enough to access your account. If the service offers a choice, prefer a security key or an authenticator app over SMS, and set up a way to recover access straight away.

What is a data leak?

Fri, 25 Sep 2026 12:10:01 +0200

In brief: A data leak occurs when information reaches unauthorised people or is made available to them. It may result from an attack, human error or inadequate system security—it does not necessarily mean that data has been published online. The consequences depend primarily on the type of information exposed: an email address leak calls for different action than the exposure of a password or a PESEL number, Poland’s national identification number.

What Is AGI?

Fri, 25 Sep 2026 08:23:54 +0200

In brief: AGI is artificial general intelligence: a system that would be able to learn and solve a wide variety of problems, including in situations new to it, at a level comparable to a human. However, there is no single, universally agreed definition or test confirming that AGI has been achieved. A versatile chatbot is not automatically AGI, and intelligence alone does not imply consciousness.

What artificial general intelligence means

AGI stands for artificial general intelligence. The word “general” describes the range of capabilities: it is not about mastering a single task, but about being able to apply knowledge and skills across many fields. Such a system should also handle problems for which no detailed procedure has been prepared in advance.

What Is GPT?

Fri, 25 Sep 2026 08:21:04 +0200

In brief: GPT is a family of artificial intelligence models that generate text based on patterns learned during training and the context provided in a conversation. They can explain concepts, edit content or help with programming, but they can also present incorrect information convincingly. GPT is a model, while ChatGPT is an application that gives users access to models and additional tools.

What does GPT stand for?

GPT stands for Generative Pre-trained Transformer. Each part of the name describes an important feature of this technology:

What Is a Prompt?

Thu, 24 Sep 2026 11:07:13 +0200

In brief: A prompt is the input you give an artificial intelligence model to get a response or assign a task. It can be a question, an instruction or a combination of instructions and material to analyse. A good prompt clearly defines the expected result, but does not guarantee that the AI’s response will be true or correct.

What does a prompt mean in practice?

In a conversation with generative AI, meaning artificial intelligence that creates things such as text, images or code, a prompt could be a sentence like: “Explain how an internet domain works.” A more detailed prompt may include a description of the situation, data, constraints and an example of the expected response. It does not have to be written in a special language or use technical syntax.

What is a TXT record?

Thu, 24 Sep 2026 11:02:04 +0200

In brief: A TXT record is an entry in DNS, the system that handles domain names, which stores text information. It is used, among other things, to confirm control over a domain and publish email authentication settings. It does not redirect a website or specify a web server’s address — its meaning depends on the service that reads the stored text.

How does a TXT record work, and what does it contain?

DNS associates domain names with various types of information, not just server IP addresses. A TXT record makes text available under a specific name, such as example.com or _dmarc.example.com. A program querying DNS reads this text and interprets it according to the rules of the relevant service.

What is Docker?

Thu, 24 Sep 2026 10:45:34 +0200

In brief: Docker is a platform for building and running applications in containers: isolated environments with the necessary libraries and tools. It helps reproduce similar conditions on a developer’s computer, during testing and on a server. It does not replace hosting and is not a full virtual machine.

How Docker works and what a container is

An application needs not only code but also a runtime environment: for example, a specific version of Python, libraries and system tools. When these elements differ between computers, a program may work for one person but produce errors for another. Docker helps define and prepare these dependencies in a repeatable way.

What is SEO?

Wed, 23 Sep 2026 22:44:45 +0200

In brief: SEO consists of activities that help a website appear in unpaid search results for queries related to its content or offerings. These include useful content, a technically sound website, and building its credibility. The business goal is not simply a high ranking, but reaching the right audience—with no guarantee of a particular position in the results or a deadline for achieving results.

What does SEO involve, and how does it differ from advertising?

SEO stands for Search Engine Optimization. In Polish, it is also often referred to as pozycjonowanie, or improving search rankings. It involves making it easier for a search engine to identify a website’s content and ensuring that the content meets the needs of someone looking for information, a product, or a service.

What is a subdomain?

Wed, 23 Sep 2026 22:43:53 +0200

In brief: A subdomain is an address created within another domain, such as sklep.przyklad.pl within przyklad.pl. It lets you separate a shop, application or another part of a website, including hosting it separately. You usually do not need to register it separately, but you do need to configure it in DNS and in the service it should point to.

How do you recognise a subdomain in an address?

In the address blog.przyklad.pl, the word blog identifies a subdomain created under przyklad.pl. Domain names form a hierarchy: additional components added on the left let you create more specific addresses. You can therefore also create pomoc.sklep.przyklad.pl, although long names can be inconvenient for users.

What Is a Cache?

Wed, 23 Sep 2026 22:42:54 +0200

In brief: A cache stores data that may be needed again so it can be accessed more quickly. It means a browser does not have to download the same files every time, and a server does not have to repeat some calculations. Sometimes, however, the stored data is outdated — refreshing it or clearing the relevant cache can help.

How does a cache work?

When an application needs particular data, it can first check whether it has it in its cache. If it finds a copy that it can use under the applicable rules, it reads that copy instead of accessing the source. This is called a cache hit. If there is no copy, or the copy cannot be used, the application retrieves or calculates the data again.

What Is a Proxy?

Wed, 23 Sep 2026 22:41:42 +0200

In brief: A proxy is an intermediary that forwards requests between a device and an online service, such as a website. It can be used to control access, cache content or hide a user’s IP address from the website they visit. However, using a proxy alone does not guarantee anonymity or connection encryption.

How does a proxy server work?

Without a proxy, your browser connects to the server of the website you visit. Once an intermediary is configured, the browser sends its request to that intermediary, which contacts the destination server and forwards the response. Depending on its configuration, a proxy can handle a single application, selected types of connections or traffic from many users on a network.

What is IP?

Wed, 23 Sep 2026 22:38:21 +0200

In brief: IP stands for Internet Protocol, a set of rules for transmitting data between networks. In everyday usage, “IP” means an IP address — a number assigned to a device’s network connection that helps direct data to the right destination. This address is not a permanent identifier of a person: it can change, and many devices often share a single public address.

What is an IP address used for?

When you open a website, your computer sends a request to a server, and the server sends a response back. IP addresses identify the source and destination of packets being transmitted — small portions of data. Routers — devices that connect networks — use the destination address to forward packets.

What Is a VPN?

Wed, 23 Sep 2026 22:37:00 +0200

In brief: A VPN is a virtual private network that creates an encrypted connection between your device and a VPN server. It can provide secure access to a company’s network or route internet traffic through an intermediary server, changing the IP address visible to the websites you visit. It does not guarantee anonymity and does not replace protection against scams, malware or account takeovers.

How a VPN works and who can see your activity

VPN stands for Virtual Private Network. It sends data through what is known as a tunnel: a connection protected by encryption. In a typical consumer service, an app connects your device to the provider’s server, which then forwards traffic to the internet. A website will then usually see the VPN server’s IP address—its identifier on the network—instead of your connection’s public IP address.

What Is CERT Polska?

Wed, 23 Sep 2026 18:19:49 +0200

In brief: CERT Polska is a team within NASK that analyses online threats and responds to security incidents. You can report suspicious text messages, fake banking websites, messages designed to steal data, or malware, among other things. Reporting helps contain the threat, but does not replace contacting your bank, the police, or the administrator of the affected system.

What is CERT Polska, and where does it operate?

CERT stands for Computer Emergency Response Team: a team that responds to computer incidents. An incident is an event that compromises the security of data or systems, such as an account takeover, a computer infection, or unauthorised access to a company network.

What is NASK?

Wed, 23 Sep 2026 17:06:44 +0200

In brief: NASK, short for Naukowa i Akademicka Sieć Komputerowa (Research and Academic Computer Network), is a state research institute whose work includes cybersecurity, research into digital technologies and education. It also operates the .pl domain registry, maintaining the central system of information about names registered under Poland’s country-code domain. For a website owner, the key distinction is this: NASK is responsible for the registry, but domain registration and renewal are usually handled by your chosen registrar.

What is a .pl domain option?

Wed, 23 Sep 2026 17:04:40 +0200

At a glance: A domain option gives you priority to register an already registered name if it is released while the option remains valid. For .pl, this mechanism operates within the registry run by NASK. Buying an option does not buy the domain: the current registrant can continue renewing it indefinitely.

What do you buy with an option?

You buy conditional priority, not the right to use the address. The registrant is the person or organisation entitled to use the domain under its registration agreement. Another person’s option does not remove those rights or oblige the registrant to sell.

What Is Linux?

Wed, 23 Sep 2026 13:25:15 +0200

In brief: Linux is an operating system kernel: software that acts as an intermediary between programs and computer hardware. In everyday usage, the name also refers to complete systems built on this kernel, such as Ubuntu, Debian or Linux Mint. You can use them instead of Windows for work and everyday tasks, but before switching, you need to check that the applications and devices you need are compatible.

Kernel, system and distribution — how do they differ?

An operating system manages a computer and allows you to run programs. Its central component, the kernel, allocates memory and processor time to applications and handles devices through drivers. Linux is just such a kernel, not a single ready-made product with a fixed desktop appearance.

What Is an SSH Key?

Wed, 23 Sep 2026 11:07:43 +0200

In brief: An SSH key verifies your identity when you connect securely to a server or service, such as a code repository. In practice, you use a pair: a public key, which you give to the service, and a private key, which stays on your device. This type of login can replace your account password, but you must protect the private key.

SSH, short for Secure Shell, is a protocol that enables secure communication with another computer over a network. It is used for tasks such as managing servers, transferring files via SFTP, and communicating with Git repositories. An SSH connection is encrypted whether you log in with a password or a key — the key primarily changes how your identity is verified.

What is JSON?

Wed, 23 Sep 2026 11:04:42 +0200

In brief: JSON is a text-based format for storing and exchanging data, used in applications, configuration files and communication with servers, among other things. It organises information using names, values and lists, so both people and programs can read it. It is not a programming language — it describes data but does not contain instructions for executing it.

What is JSON used for?

The name JSON stands for JavaScript Object Notation. Although the format originated from the notation used for objects in JavaScript, it is independent of that language. It is supported by Python, Java, PHP and C#, among others.

What Is WordPress?

Wed, 23 Sep 2026 10:55:45 +0200

In brief: WordPress is a free system for building websites and managing their content without having to write code for every change. You can use it to run a blog, a business website, a portal or an online store. The software itself is free, but publishing your own website usually means paying for a domain name and hosting; WordPress should not be confused with the WordPress.com service.

How does WordPress work, and what is it used for?

WordPress is a CMS, or content management system: software that lets you add and edit content through an administration dashboard. Instead of changing the website’s code, you log in to the dashboard, enter text, insert images and publish your content. The system saves the content and displays it to visitors in your chosen visual layout.

What Is a VPS?

Wed, 23 Sep 2026 10:51:01 +0200

In brief: A VPS is a virtual server isolated on a physical machine, with its own operating system and defined resources. It offers more configuration freedom than shared hosting, but usually requires you to administer it yourself or pay for technical management. It is useful for applications and websites with non-standard requirements; a simple business website usually does not need one.

How does a VPS work, and what are you actually renting?

VPS stands for Virtual Private Server. A technology called virtualization allows one physical server to be divided into several isolated environments. Each can have its own operating system, users, and installed programs, although they still use shared hardware infrastructure.

What Is DDoS?

Wed, 23 Sep 2026 09:20:10 +0200

In brief: DDoS is an attack designed to overload a website, server or other internet service with traffic from multiple sources, making it difficult or impossible to use. It does not necessarily involve a break-in or data theft—its main goal is to make the service unavailable. Protection involves identifying and filtering out malicious traffic, ideally before it reaches the overloaded infrastructure.

How does a DDoS attack work?

DDoS stands for Distributed Denial of Service. A server has limited network bandwidth, processing power and capacity for simultaneous connections. The attacker attempts to exhaust at least one of these resources, causing legitimate users to encounter errors, wait for a response or fail to connect.

What Is CRM?

Tue, 22 Sep 2026 19:28:23 +0200

In brief: CRM is an approach to managing customer relationships, as well as the name for systems that help you do so. CRM software stores contact details, conversation histories, proposals and tasks so that the team knows what has been agreed with a customer and what the next step should be. It is particularly useful when managing contacts through email, notes and spreadsheets starts leading to mistakes or overlooked matters.

What Is SaaS?

Tue, 22 Sep 2026 10:52:44 +0200

In brief: SaaS (Software as a Service) is a model in which you use an application maintained by its provider, usually over the internet. Instead of installing and running software on your own server, you create an account and choose a plan — most often a subscription, although free versions also exist. The provider handles the application’s operation and updates, but you remain responsible for tasks such as configuring access and assessing whether the service meets your needs.

What does WWW mean?

Tue, 22 Sep 2026 10:51:10 +0200

In brief: WWW stands for World Wide Web, a system of pages and resources connected by links that we access over the internet, usually through a browser. WWW is not the same as the internet: the internet provides the infrastructure, while WWW is one of the services running on it. Meanwhile, www at the beginning of a website address is a conventional hostname — it is not compulsory and does not, by itself, indicate that a website is safe.

What is HTTPS?

Tue, 22 Sep 2026 10:48:42 +0200

In brief: HTTPS is a way for a browser to communicate with a website that encrypts the data being transmitted and helps confirm that you are connecting to the correct server for a given domain. Among other things, it protects passwords, forms and response content from being intercepted or altered in transit. However, it does not guarantee that the website itself is trustworthy — a fraudulent website can also use HTTPS.

What is a copilot?

Tue, 22 Sep 2026 10:40:40 +0200

In brief: A copilot is literally a second pilot, and in technology, an AI assistant that helps you carry out tasks such as writing text, analysing information or creating code. The name can refer to a category of assistants or a specific product, such as Microsoft Copilot or GitHub Copilot. Such an assistant makes suggestions and can perform certain actions, but its responses need to be checked.

What does copilot mean in a program or application?

A copilot is an artificial intelligence assistant available as a standalone service or as a feature of another program. It usually uses a language model — a system trained to process and generate language, including code. The user describes a task in everyday language, and the assistant prepares a response or helps perform an operation.

What is Claude?

Tue, 22 Sep 2026 10:34:08 +0200

In brief: Claude is an artificial intelligence assistant from Anthropic, as well as the name of the family of models that power it. It helps with tasks such as writing, analysing documents, explaining concepts and creating code based on instructions in everyday language. It can speed up your work, but it can also provide incorrect information, so important answers need to be checked.

What is Claude and how does it work?

Claude is based on a large language model: a system trained to process and generate language using patterns learned during training. When you enter a question, the model generates an answer, taking into account your instructions and the available context of the conversation. It does not work like a database from which it always retrieves a ready-made, verified fact.

What is Codex?

Tue, 22 Sep 2026 10:28:56 +0200

In brief: Codex is a name used by OpenAI for AI technology and tools that help with programming. It lets you describe tasks in everyday language and then receive code, explanations or proposed changes to a project; depending on the environment, it can also perform tasks on files and run tests. Outside technology, the Latin word “codex” means a codex—a historical form of the book—so its precise meaning depends on the context.

What is SSL?

Tue, 22 Sep 2026 09:25:23 +0200

In brief: SSL is the common name for the technology that secures the connection between a browser and a website’s server. Modern websites use its successor, TLS, although the term “SSL certificate” is still widely used. This connection protects data in transit from being read or altered along the way, but does not guarantee that the website’s owner is trustworthy.

SSL, TLS and HTTPS — how do they differ?

SSL, or Secure Sockets Layer, is an older protocol for securing network communications. Its successor is TLS — Transport Layer Security. Older SSL versions are obsolete and should not be used; however, the name has persisted in hosting and certificate offerings.

What Is FTP?

Mon, 21 Sep 2026 21:49:30 +0200

In brief: FTP is a protocol, or set of communication rules, used to transfer files between a computer and a server. You can use it, for example, to upload a website to your hosting or download a copy of its files. Standard FTP does not encrypt data or passwords, so choose SFTP or FTPS for connections over the internet if your provider supports them.

What is FTP used for, and how does it work?

FTP stands for File Transfer Protocol. Communication takes place between a client, the program that initiates the connection, and a server that makes files available. After logging in, users can perform operations allowed by their account permissions: upload and download files, create directories, rename files or delete data.

What Is Google Analytics?

Mon, 21 Sep 2026 14:15:23 +0200

In brief: Google Analytics is Google’s tool for analysing how people use websites and apps. It helps you see where visitors come from, what actions they take and whether they fulfil business goals, such as making a purchase or submitting an enquiry. The current generation, Google Analytics 4 (GA4), bases its measurement on events, meaning recorded interactions. However, the results are not a complete record of all visits — they depend on factors including configuration, user consent and script blocking.

What Is Google Search Console?

Mon, 21 Sep 2026 14:13:34 +0200

In brief: Google Search Console is a free Google tool that shows how a website performs in search and whether Google can read and index its pages. You can use it to check the queries leading to your website, clicks from search results and technical problems. Simply setting up an account does not improve rankings or guarantee indexing, but it helps you identify what needs fixing.

What is Google Search Console used for?

Search Console is designed for website owners, editors, marketers and people responsible for a website’s technical maintenance. You do not need to be a developer to check which content attracts users from Google. However, fixing some errors may require help from an administrator or the website’s developer.

What Is OpenRouter?

Sun, 20 Sep 2026 19:12:06 +0200

In brief: OpenRouter is an intermediary platform that lets you use artificial intelligence models from different providers through one API, an interface for communication between programs. Instead of connecting your application to each AI service separately, you can use a shared access point and switch your chosen model. OpenRouter is neither a single model nor a subscription to all chatbots — its usefulness depends on your application’s needs, costs and data processing policies.

What is vibe coding?

Sun, 20 Sep 2026 19:01:14 +0200

In brief: Vibe coding is a way of creating software in which you describe the desired outcome to artificial intelligence, and it generates and revises the code. In its strict sense, it means working mainly through conversation and assessing how the application behaves, without closely examining its code. It makes building prototypes easier, but a working screen is not proof that a program is secure, correct, and ready for customers.

What Is PKI?

Sun, 20 Sep 2026 18:54:13 +0200

In brief: PKI is public key infrastructure: a system of certificates, institutions, procedures and tools that links a cryptographic key to a domain, person or device. This allows a browser to check whether it is connecting to the correct server, and a corporate network to recognise an authorised computer. PKI underpins many uses of HTTPS, authentication and digital signatures, but does not itself guarantee the honesty of a website owner or the security of an entire system.

What is an LLM?

Sun, 20 Sep 2026 18:49:59 +0200

In brief: An LLM, or large language model, is an artificial intelligence system trained on large datasets that can process and generate language. It can answer questions, summarise documents, translate, and help write text and code. It generates answers based on learned patterns and the context it receives, so fluent, convincing text is no guarantee of truth.

What does LLM mean, and how does it differ from a chatbot?

LLM stands for Large Language Model. “Large” refers to the scale of the model, including the number of its parameters — numerical values adjusted during training — and the scale of the data and computation used to train it. There is no single, universally accepted threshold at which a model becomes “large”.

What is Let’s Encrypt?

Sun, 20 Sep 2026 11:20:29 +0200

In brief: Let’s Encrypt is a free certificate authority that issues certificates enabling HTTPS on a website. These allow a browser to verify the server’s identity for a given domain and establish an encrypted connection. With many hosting providers, you only need to enable the relevant option in the control panel, but you also need to ensure automatic certificate renewal and correct website configuration.

What does a Let’s Encrypt certificate provide?

Let’s Encrypt is run by the nonprofit Internet Security Research Group (ISRG). It operates as a certificate authority: an entity that issues digital certificates trusted by browsers and other software. A certificate binds a domain name to a public key used to secure the connection.

What is SSH?

Sun, 20 Sep 2026 11:17:00 +0200

In brief: SSH (Secure Shell) is a protocol, or a set of communication rules, that lets you securely connect to another computer over a network and run commands on it. It encrypts the data being transmitted, making it suitable for remote server management over the internet as well. To connect, you need a program that supports SSH, the server address, a user account, and a password or a properly configured key.

What Is a CDN?

Sun, 20 Sep 2026 10:54:55 +0200

In brief: A CDN is a network of servers that delivers website content to users from appropriately selected locations, rather than fetching everything from a single server. It can reduce loading times for images, scripts and other files, and ease the load on your hosting. However, it does not replace a well-performing server or website optimisation, and its effectiveness depends on the type of content and configuration.

How a CDN and caching work

CDN stands for Content Delivery Network. Its servers act as intermediaries between the visitor and the origin server — the place where the website runs or its original files are stored. Traffic is directed to an appropriate network node, not necessarily the closest geographically, but one also selected according to network conditions and availability.

What Is Web Hosting?

Sun, 20 Sep 2026 06:32:45 +0200

In brief: Web hosting is a service that provides server resources so that a website can be available to visitors. It stores the website’s files and, depending on the plan, its database and email as well. A domain name is the website’s address, while hosting provides the space and environment it needs to operate.

How does website hosting work?

A server is a computer or computing environment that handles requests sent over a network. When someone opens a website in a browser, the server delivers the necessary content: text, images, styles and scripts. For a WordPress-based website, it also runs software that uses a database and prepares a response for the user.

What Is an AI Agent?

Fri, 18 Sep 2026 08:32:10 +0200

In brief: An AI agent is a system that uses artificial intelligence to achieve a goal: it chooses successive steps, uses available tools and responds to the results of its actions. Unlike a simple chatbot, it does not have to stop at providing an answer — it can, for example, check an order and prepare a complaint ticket. Its degree of autonomy depends on the permissions and rules assigned to it, not on the name “agent” alone.

What is MCP?

Mon, 14 Sep 2026 21:16:30 +0200

In brief: MCP (Model Context Protocol) is an open standard that allows AI applications to use external data and tools in a consistent way. It enables an assistant to read company documentation, check a task in a project management system or invoke a specific operation, for example. MCP is not an AI model and does not itself grant access to all resources — its capabilities depend on the connected services, configuration and permissions.

What is Cloudflare?

Mon, 14 Sep 2026 21:12:52 +0200

In brief: Cloudflare is a network services platform that can speed up website delivery, manage domains and reduce malicious traffic. In a typical configuration, it sits between the visitor and the website’s server, but does not replace its hosting. Using Cloudflare’s DNS alone does not mean that website traffic passes through its protection systems.

How Cloudflare works in front of a website’s server

Without an intermediary, the browser connects to the server running the website. Once the appropriate configuration is enabled, Cloudflare first accepts the user’s connection, then either responds from its own cache or retrieves content from the origin server. The origin server is simply the hosting or other infrastructure on which the actual website runs.

What Are DNS Name Servers?

Sat, 12 Sep 2026 15:21:41 +0200

In brief: DNS name servers provide information about a domain, including the address of its website server and the servers handling its email. In a domain registrar’s control panel, “name servers” usually means authoritative servers: those that hold the domain’s actual DNS configuration. They do not store the website itself — they indicate where the services associated with the domain are located.

How name servers help open a website

DNS, or the Domain Name System, lets you find technical information associated with a readable name such as example.com. One of its tasks is to determine the IP address — the network address needed to connect to a server. DNS also handles information related to email, domain verification and other services.

How to choose a good domain name

Wed, 09 Sep 2026 15:52:14 +0200

At a glance: A good domain is memorable, easy to spell from speech and recognisably connected to your brand. Avoid unnecessary characters and restrictions that will hinder expansion. Before registration, check similar brands, past use and renewal costs as well as availability.

Start with the brand and audience

A domain is the name used in website and email addresses, such as yourbrand.pl. Hosting supplies the server resources for the website. You can choose the name independently of where you later host the site.

What Is Majestic Million?

Fri, 28 Aug 2026 07:30:01 +0200

In brief: Majestic Million is a list of one million domains ranked by the number of subnets linking to them, as detected by Majestic. The ranking describes a domain’s prominence within the link graph examined by this tool, but does not directly measure traffic, revenue or website quality. It is best used as one reference point when analysing domains and links.

What exactly the ranking shows

Majestic is a tool that analyses links between websites. Using its own index, it creates Majestic Million: a list of the highest-ranking domains by the number of referring subnets. A domain ranked 10,000 therefore has a broader profile of referring networks than a domain ranked 100,000 — at least according to Majestic’s data and counting method.

Notable Cases of Typosquatting

Sat, 22 Aug 2026 12:31:40 +0200

In brief: Typosquatting involves registering addresses similar to a legitimate domain to exploit a user’s typing mistake or inattention. Notable cases involve brands such as Verizon and Microsoft, as well as traffic captured by John Zuccarini. These domains were used to display advertisements, redirect visitors, steal information, or make it difficult for users to leave a site.

What exactly is typosquatting?

Typosquatting is a form of cybersquatting: exploiting domains associated with someone else’s name or trademark. Its defining feature is a mistake a user might make when typing an address: an omitted letter, a substituted character, an incorrect sequence, or an extra character.

How to Choose a Domain Name for an Online Course

Fri, 07 Aug 2026 09:23:51 +0200

In brief: A good online course domain name is short, easy to write down after hearing it, and broad enough not to limit your future offerings. First decide whether the domain should promote the course brand, an expert, or an entire learning platform, and only then choose the name and extension. Before registering it, check the rights to the name, the domain’s history, and the full cost of maintaining it.

A domain name for a marketing agency — creative or descriptive?

Thu, 06 Aug 2026 18:05:08 +0200

In brief: A good domain name for a marketing agency should, above all, be easy to remember, spell and share in conversation. A creative name helps build a distinctive brand, while a descriptive one explains the agency’s specialisation more quickly. The safest choice is usually a distinctive brand name complemented by a clear description of services on the website.

Creativity and clarity solve different problems

A creative domain is based on a brand name, a coined word or an unexpected association. It can set an agency apart without limiting it to a single service. Its drawback is that, before making contact, people may not always know what the company does.

How to choose a domain name for a doctor, clinic or medical pract

Wed, 05 Aug 2026 09:16:17 +0200

In brief: A good medical domain name should be easy to write down after hearing it, match the name of the doctor or practice, and remain flexible enough for the future. Before registering it, check the rights to the name, the address’s history and the availability of similar variants, and register the domain in the name of its rightful owner—not the website developer.

First, decide what the domain should represent

A doctor running an individual practice can base the domain on their first and last name, for example annakowalska.pl. This address supports a personal brand and remains relevant after a change of workplace, but it may limit growth if the website is later intended to represent several specialists.

How to Choose a Domain for Your Law Firm

Mon, 03 Aug 2026 13:40:59 +0200

In brief: a law firm’s domain should match the name it uses in practice, be easy to give to clients, convey professionalism and leave enough room for the team to grow. A surname supports a personal brand, a firm name helps build an organisation independent of one person, and a specialism quickly explains the services but may define them too narrowly. Usually, the best choice is a short brand-based or hybrid name: a recognisable name or surname with a subtle reference to law. A phrase such as “employment law” generally works better as a page within the website than as the firm’s entire identity.

A Domain Name for a Franchise or Local Network

Sun, 02 Aug 2026 14:21:28 +0200

In brief: A franchise or local network should generally operate under a single brand domain that is easy to write down, with location pages in subdirectories, such as marka.pl/krakow. Separate domains for individual locations mainly make sense when they retain independent brands or need standalone websites. Before registering a domain, check the rights to the name and establish who controls the domain when the franchisee changes.

One brand domain or a separate domain for each location

The most predictable solution is a single main domain held by the franchisor or network operator. Local pages can be created under it, such as marka.pl/warszawa-mokotow and marka.pl/poznan-jezyce. Customers see one consistent web address, while head office manages content, security and changes across the network.

How to monitor domains similar to your brand

Sat, 01 Aug 2026 12:20:21 +0200

At a glance: Effective monitoring covers more than the same name under other extensions. Watch misspellings, added words, internationalised characters and actual domain use. Prioritise alerts by risk: similarity alone does not prove abuse, while page content, email configuration and impersonation attempts provide important context.

Start with realistic name variants

Identify the brand elements that may appear in a domain: full name, abbreviation, product name and distinctive slogan. Build a manageable set of plausible variations.

Defensive Domain Registration — Which Variants Are Worth Buying?

Fri, 31 Jul 2026 13:30:38 +0200

In brief: Defensive domain registration means buying several variants of an address to reduce customer mistakes, brand impersonation and the acquisition of important names by other parties. Start by securing the core extensions for the market you operate in and the most likely spelling variants. There is no need to buy every possible extension or dozens of random misspellings.

Start with the domains most relevant to your business

The most important domain is the one used as the main address for your website and email. For a business focused on Poland, a name in .pl is usually the natural starting point. If the brand operates internationally or plans to sell abroad, .com and the extensions of countries where the offering is actually targeted become more important.

Domain names and phishing — how can you protect customers from

Thu, 30 Jul 2026 09:07:16 +0200

In brief: Registering your main domain alone is not enough, because scammers can use a similar address or spoof the sender of a message. The best protection combines registrar account security, correctly configured SPF, DKIM and DMARC, monitoring of similar domains, and clear rules for communicating with customers.

How domains are used in phishing

Phishing is an attempt to obtain data, money or access through a message or website that impersonates a trusted organisation. An attacker does not need to take over a company’s real domain. More often, they register a deceptively similar address, such as twojsklep-pomoc.pl instead of twojsklep.pl (Polish for “your shop-help” and “your shop”), or replace a letter with another character.

DNSSEC — is extra protection for your domain worth it?

Wed, 29 Jul 2026 13:55:02 +0200

In brief: DNSSEC is worth enabling if your DNS provider and registrar support it through automated processes and the domain is important to your business, email or sales. It reduces the risk of spoofed DNS responses, but does not encrypt traffic or replace HTTPS, account protection at your registrar, or proper email configuration. However, a mishandled change of keys or DNS servers can temporarily make the domain unavailable.

What exactly DNSSEC protects

DNS, the Domain Name System, translates a name such as sklep.example into a server address. A standard DNS response contains no mechanism that allows the recipient to cryptographically verify its authenticity. An attacker may try to supply a false address, for example by poisoning a DNS server’s cache.

WHOIS and RDAP — how to check domain information

Tue, 28 Jul 2026 08:33:16 +0200

In brief: WHOIS and RDAP let you check a domain’s technical and registration data, including its status, registration dates and DNS servers. RDAP is the newer, structured successor to WHOIS, but the information visible depends on the registry, the domain operator and data protection rules. The absence of an owner’s name does not mean that the domain is available or was registered anonymously.

How WHOIS and RDAP differ

WHOIS is an older protocol that provides domain information in text format. Individual registries may use different field names and format their results differently, which can make automated comparisons of WHOIS records difficult. Queries are made through a web form or a client using the WHOIS protocol.

Changing a domain registrant: what to check

Mon, 27 Jul 2026 09:15:27 +0200

At a glance: Changing a domain registrant involves more than editing account details. It should include an agreement, secure settlement and a controlled handover. Before paying, confirm the seller’s identity, authority over the domain and the registrar’s procedure. An AuthInfo code does not always change the registrant and does not replace a sales agreement.

What does a change of registrant mean?

In Poland, the term cesja domeny commonly means changing the registrant: the person or organisation entitled to use the address under the registration agreement. A domain is not owned in the same way as a physical object such as a car. Its use is governed by the relevant registry rules and the agreement made through the registrar.

AuthInfo / EPP code — what is it and when do you need it?

Sun, 26 Jul 2026 07:24:47 +0200

In brief: An AuthInfo code, also known as an EPP or transfer code, is used to authorise a domain transfer between registrars. It is usually not needed to change hosting, DNS servers or registrant details. Treat it like a confidential password and obtain it only when you are ready to start the transfer.

What is an AuthInfo or EPP code?

AuthInfo is a unique string of characters assigned to a domain that confirms that the person initiating the transfer is authorised to do so. The term “EPP code” comes from the protocol used to manage many global domains. In practice, “AuthInfo”, “AuthCode”, “EPP code” and “transfer code” often refer to the same type of security credential.

How does domain purchase escrow work?

Sat, 25 Jul 2026 07:16:35 +0200

At a glance: An escrow provider holds the buyer’s money until the domain has been transferred correctly. The seller can confirm payment is secured before handing over the domain, while the buyer avoids paying an unfamiliar seller directly in advance. Protection depends on precise terms and a trustworthy provider.

What does domain escrow do?

Escrow separates funding from the domain handover. The provider receives the buyer’s funds, confirms them to the seller and pays out after agreed conditions are met.

How to Buy a Domain from Its Current Owner

Fri, 24 Jul 2026 08:47:26 +0200

In brief: First confirm that the seller has the right to dispose of the domain, and only then negotiate the price. Record the terms of sale in a contract, secure the payment through an escrow service or a controlled process managed by an intermediary, and confirm that you have taken control of the domain in your own registrar dashboard. A transfer code alone is not enough if the parties have not agreed on their responsibilities, the deadline and the scope of the transaction.

How to prepare a domain sales page

Thu, 23 Jul 2026 08:15:26 +0200

At a glance: A domain sales page should immediately say the name is for sale, state a price or explain how to make an offer, and provide an easy contact route. A focused page with credible seller information and a clear transaction process is usually sufficient.

What should buyers see immediately?

Someone entering the domain may not know it is for sale. Show the full name, an unambiguous sale message and a prominent purchase or enquiry action.

What Does It Mean When a Domain Is Parked?

Tue, 21 Jul 2026 10:57:45 +0200

In brief: A parked domain is registered but does not yet lead to its intended website. Instead, it may display a provider’s page, ads, a technical notice or a sale offer. This does not mean the domain is available or has expired.

How domain parking works

Domain parking means pointing a domain to a temporary page rather than its intended website. The owner retains the right to use the address as long as they maintain its registration and pay for renewal. Parking alone does not determine whether an online store, blog or company website will later appear at that address.

When does a 301 redirect after buying a domain make sense?

Mon, 20 Jul 2026 09:14:56 +0200

At a glance: A 301 redirect makes sense for an acquired website’s old address, a recognised brand variation or a domain people actually use. A topical name without useful traffic, credible history or matching content is not a shortcut to search visibility.

What does a 301 redirect do?

HTTP status 301 tells browsers and search engines that an address has moved permanently to another URL. Visitors opening the old address are automatically sent to the destination.

Subdomain or subdirectory — which is better for SEO?

Sun, 19 Jul 2026 13:56:01 +0200

In brief: For content closely related to the main website, a subdirectory, such as example.pl/blog/, is usually the simpler and safer choice. A subdomain, such as blog.example.pl, makes sense when that part of the site is a separate product, requires different infrastructure or should be managed independently. The address format alone does not guarantee better rankings — content, linking, crawler accessibility and technical consistency also matter.

How a subdomain differs from a subdirectory

A subdomain is the part of an address placed before the main domain, for example sklep.example.pl. It can run on a different server, use a separate system and have its own technical settings.

Landing page on a separate domain or the main domain?

Sat, 18 Jul 2026 12:05:40 +0200

In brief: In most cases, it is best to publish a landing page on the main domain, for example firma.pl/oferta, because this makes it easier to manage branding, analytics and organic visibility. A separate domain makes sense when the page represents an independent product, event or brand, or needs to be separated from the main website in terms of technology and communications. The choice of address alone does not determine a campaign’s effectiveness — a coherent offer, page speed and a clear call to action matter more.

A Domain Name for a Newsletter or Online Publication

Fri, 17 Jul 2026 09:27:32 +0200

In brief: A good newsletter domain is short, easy to dictate and broad enough not to limit future topics or formats. It should belong to the publisher, and message sending must be technically separate from an arbitrary domain provided by the platform. Before buying, check the name in search engines, trademark registers and popular social media services.

The name should work beyond the inbox

Over time, a newsletter may become a website, podcast, paid community or event organiser. A name that describes just one channel, such as “PorannyMail” (Polish for “Morning Mail”), may therefore prove less flexible than one referring to the subject, audience or character of the publication.

Choosing a marketplace domain: what matters?

Thu, 16 Jul 2026 06:11:58 +0200

In brief: a marketplace domain should be memorable, inspire confidence during transactions, and be broad enough to accommodate new sellers, categories, and markets. A brand-based name offers the greatest freedom to scale. A category-based name explains the offering more quickly but can tie the platform to one segment. A short brand name or a hybrid name that will not need changing as the site grows is often a good compromise.

How to choose a domain name for a mobile app

Tue, 14 Jul 2026 22:17:06 +0200

In brief: A mobile app’s domain name should be easy to write down after hearing it, match the product name and be flexible enough to cover a website, user dashboard and future services. Before registering it, check trademarks, names in app stores, social media profiles and similar-sounding addresses. If the main domain is taken, it is better to add a short word related to the product than to choose a complicated spelling.

How to Choose a Domain Name for B2B SaaS

Tue, 14 Jul 2026 08:17:54 +0200

In brief: A good domain name for B2B SaaS is short, easy to share in conversation and flexible enough not to limit the product’s growth. It should fit the brand, but it does not have to describe every feature of the system precisely. Before registering it, check its history, potential conflicts with other parties’ names or trademarks, and the availability of similar names.

Start with product positioning, not an available domain

The domain name should reflect how the company wants to be remembered. B2B SaaS, meaning software sold to businesses on a subscription basis, can base its name on the brand, the product category or the result the customer achieves.

Domain names and email deliverability — what do you need to know?

Mon, 13 Jul 2026 17:27:47 +0200

In brief: A good domain name alone does not ensure that messages reach the inbox. Domain and sending infrastructure reputation, correctly configured SPF, DKIM and DMARC records, and how you acquire recipients also matter. A new domain should be introduced gradually, while monitoring bounces, complaints and authentication results.

How a domain affects deliverability

Email deliverability means a message’s ability to reach the recipient’s mailbox, ideally the main inbox rather than the spam folder. Mail servers assess many signals: the domain shown in the sender field, the domains used in the technical elements of the message, the server’s IP address, the message content and recipients’ reactions.

How to Choose a Domain Name for an AI Project

Mon, 13 Jul 2026 17:16:44 +0200

In brief: A good domain name for an AI project should be easy to spell after hearing it, suit its audience and avoid limiting the product to a single feature or model. Including “AI” can quickly explain the nature of the project, but it is not essential. Before registering, you need to check not only the address’s availability, but also similar brands, social media profiles and the domain’s history.

Start with the product and its audience

The domain name should answer a simple question: who will be typing or sharing this address? A tool for developers calls for a different name from an assistant for accountants or an expert newsletter about artificial intelligence.

Domains and social media: what should match?

Sun, 12 Jul 2026 10:43:50 +0200

In brief: Your domain, profile names and social media messaging should all point to the same brand, but they do not need to match character for character. What matters most is a recognisable name, account handles that are easy to associate with it, a consistent description of the business and links that reliably lead to the right website. If the ideal username is taken, adding a clear qualifier is better than changing the brand name.

How to check whether a domain has been used for spam

Sat, 11 Jul 2026 09:15:18 +0200

In brief: There is no single test that reliably confirms a domain has a clean history. Before buying, check archived content, the backlink profile, blocklists and previous DNS settings, and assess the findings together. One suspicious signal may be a mistake, but several corroborating traces justify walking away or investigating further.

First, establish what kind of spam you are looking for

A domain may have been used to send unsolicited messages in bulk, conduct phishing, publish automatically generated pages or manipulate search results. Each of these uses leaves different traces. Email problems are primarily revealed by blocklists and IP address reputation, while content spam is more often visible in website archives and the backlink profile.

Local or global domain — which strategy should you choose?

Fri, 10 Jul 2026 12:21:05 +0200

In brief: A local domain works well when a business focuses on one country and clearly identifying the market matters. A global domain offers greater freedom to expand, but requires careful organisation of country and language versions. The choice should be based on your business plan, name availability and ability to maintain multiple sites, rather than the belief that the extension alone will ensure visibility.

What local and global domains mean

A local domain uses a country-code extension such as .pl, .de or .fr. The extension tells visitors which market the site is associated with. This can help a business communicate that it lists local prices, delivers only within one country or provides services requiring a physical presence.

How does a domain name help with international expansion?

Fri, 10 Jul 2026 09:21:57 +0200

In brief: A domain name helps with international expansion when it is easy to spell, fits the brand and supports a clear division of the website into markets or languages. It will not replace a local offering or customer service, but it can increase credibility and make it easier to develop marketing activities. The best address depends on whether the company is building one international brand or a separate presence in each country.

Can a Domain Name Increase a B2B Company's Credibility?

Thu, 09 Jul 2026 09:23:23 +0200

In brief: A domain name can increase a B2B company’s credibility, but it cannot build it on its own. It works best as a consistent part of the brand: it is simple, matches the company’s name, supports business email and leads to a website containing the details needed to verify a business partner. An unattractive or haphazard address does not rule out an offer, but it can raise unnecessary questions before the first contact.

Domain names and business email — why does it matter?

Wed, 08 Jul 2026 08:51:49 +0200

In brief: Your own domain lets you use addresses such as kontakt (at) nazwafirmy.pl, regardless of which company hosts your mailboxes. It strengthens brand recognition, gives you control over employee addresses and allows you to secure email properly. However, a domain alone does not guarantee message delivery — correct technical settings and a good sending reputation are also needed.

A domain and an email service are two different things

A domain is the name used in an address, for example nazwafirmy.pl. An email service, meanwhile, provides mailboxes, message storage, spam filters and the ability to send and receive email. Both services can come from one provider, but they do not have to.

What happens when a domain expires?

Tue, 07 Jul 2026 12:44:57 +0200

At a glance: An expired domain usually does not become publicly available immediately. Its website and email may stop working before it passes through stages determined by the registry, extension and registrar. Renewal may still be possible, but recovery can later become more expensive or impossible. Check exact deadlines with the relevant providers.

Expiry does not always mean immediate deletion

A domain is registered for a fixed period. If the registrant does not extend it in time, it expires. What follows depends on the extension, such as .pl, .com or .eu, and the company managing it.

How to protect a domain from hijacking

Sun, 05 Jul 2026 08:31:50 +0200

In brief: The most important domain safeguards are strong authentication for your registrar account, a transfer lock, checks on registrant details and reliable renewal. You also need to protect the email account used to recover access, since its compromise could open the door to changes to domain settings. In a business, access should belong to the organisation, not solely to an employee or an external agency.

What can actually be hijacked

A domain is managed through a registrar: a company that lets you register a name, renew it and change its configuration. Domain hijacking can involve an unauthorised transfer to another provider, a change of registrant or the replacement of DNS servers to direct users to the attacker’s website and email services.

Typo domains: opportunity or risk?

Sat, 04 Jul 2026 10:20:20 +0200

At a glance: Registering common misspellings of your own domain and redirecting them can protect a brand. Acquiring misspellings of other brands to capture their visitors carries legal, commercial and reputational risks. The number of possible errors is not a reason to register every variation.

What is a typo domain?

A typo domain resembles the intended address but includes an error someone might make when typing: a missing or repeated letter, transposed characters or the wrong extension.

Is it worth buying several domains for one brand?

Wed, 01 Jul 2026 10:22:35 +0200

In brief: buying several domains makes sense when it protects your brand name, catches common mistakes or secures addresses needed for expansion into other markets. You do not need to register every possible extension, however. Choose one primary domain, redirect the others to it and factor in their annual renewal costs.

When additional domains solve a real problem

The most common reason for buying additional domains is to protect a consistent name. If a company operates at nazwamarki.pl, someone else acquiring the identical name with a popular extension may cause confusion among customers. The risk is greater when the brand sells online, advertises heavily or plans to operate outside Poland.

How to Choose a Domain Name for an Online Store

Sat, 27 Jun 2026 10:18:42 +0200

In brief: A store’s domain name should be short, easy to spell after hearing it and flexible enough not to limit its future product range. Before registering it, check its history, similarity to other brands, the availability of matching social media usernames, and registration and renewal costs. Having a keyword in the address alone does not guarantee visibility or sales.

Start with a name customers can spell correctly

A good domain name passes a simple “phone test”: after hearing it once, someone can type it without further explanation. Unusual spelling, several possible variants, numbers, hyphens and words whose pronunciation does not clearly indicate their spelling can all cause problems.

Does the domain matter in Google Ads campaigns?

Sat, 20 Jun 2026 10:57:28 +0200

In brief: Neither the domain name nor its extension alone ensures a lower cost per click or a better ad position. However, the domain matters indirectly: it affects audience trust, message consistency, the proper functioning of the landing page and the campaign’s compliance with Google Ads requirements. The best choice is an address that is easy to recognise, technically reliable and consistent with the brand shown in the ad.

What a domain changes in a campaign—and what it does not

Google Ads is not a directory where a domain containing a popular word automatically wins the auction. Whether an ad is shown and how much it costs depend on many factors, including the bid, the ad’s expected performance, its relevance, the quality of the landing page and the context of the particular auction. Simply replacing firma24.pl with tanie-uslugi-miasto.pl therefore does not guarantee cheaper traffic.

How does a domain affect the cost of online advertising?

Tue, 16 Jun 2026 16:29:54 +0200

In brief: The domain name or extension alone does not usually determine the cost per click. However, it can indirectly change customer acquisition costs because it affects audience trust, landing page effectiveness, measurement quality and whether an ad can be approved. The cheapest domain therefore does not always mean the cheapest campaign.

The cost per click depends mainly on the auction, not the domain

In advertising systems, the cost of a click or impression is determined primarily by an auction. Factors include competition for a particular audience, the bid, the ad’s predicted performance, its relevance and landing page quality. The specific mechanisms differ between platforms and may change.

Short or Descriptive Domain Name — Which Should You Choose?

Sat, 13 Jun 2026 09:05:57 +0200

In brief: A short domain name is usually better for building a brand, provided it is easy to pronounce and does not need to be spelled out. A descriptive domain name tells people what the website is about more quickly, but it may limit the expansion of your offering. The best choice is not the shortest address, but one that people will remember correctly and that will still suit the company in a few years.

Does a Generic Domain Help Build a Brand?

Fri, 12 Jun 2026 11:03:45 +0200

In brief: A generic domain can help people recognise your offering and remember the address, but it does not create a brand on its own. It works best when it fits the business model, is short and does not limit future growth. Before buying, you need to assess not only the name but also its legal status, history, cost and the availability of similar addresses.

What is a generic domain?

A generic domain uses a word or phrase describing a product, service or an entire category, such as rowery.pl (bicycles), noclegi.pl (accommodation) or meble.com.pl (furniture). It should not be confused with a top-level domain, meaning an extension such as .pl, .com or .eu.

How to Sell a Domain

Wed, 10 Jun 2026 11:54:20 +0200

In brief: Selling a domain requires setting a realistic price, finding a buyer and arranging secure payment alongside a change of registrant. Do not hand over the transfer code or control of the domain before payment has been confirmed — for a larger amount, use an escrow service or an intermediary that handles domain transactions.

First, check what you are actually selling

A domain is not property in the same sense as a car or a home. The seller is its registrant and transfers to the buyer the rights and obligations arising from the agreement with the registrar. The details of the procedure depend on the domain extension, the registry operator and the registrar’s terms and conditions.

How to negotiate a premium domain purchase

Tue, 09 Jun 2026 08:47:15 +0200

At a glance: Establish a maximum budget, check the domain’s legal and technical position and base your offer on practical value. You need not disclose your full spending capacity at the outset. Record the price, payment and transfer terms, and consider escrow for a significant purchase.

First decide what the name is worth to you

A premium domain is usually attractive because it is short, memorable or commercially meaningful. The label does not establish an objective price. One company may regard a name as essential while another has many satisfactory alternatives.

How to Value a Domain Before Selling It

Wed, 03 Jun 2026 19:21:13 +0200

In brief: A domain is worth what a particular buyer is willing to pay for it, so there is no universal price list. A reasonable price is established by assessing the quality of the name, its possible uses, demand and comparable transactions. Before selling, set three figures: a minimum, a realistic transaction price and an asking price that leaves room for negotiation.

First, establish exactly what you are valuing

Registering a domain alone does not determine its value. Buyers primarily pay for a name that can shorten the path to a recognisable brand, make communication easier or suit a product. The website’s history, traffic and revenue may increase its value, but they should be assessed separately from the domain itself.

How Does a Domain Name Affect User Trust and Conversion?

Fri, 29 May 2026 11:12:24 +0200

In brief: A domain name affects first impressions, how easily an address is remembered and perceptions of a website’s security, so it can indirectly support or weaken conversion. A short, readable address that matches the brand name and contains no elements suggesting impersonation of another business works best. However, changing the domain alone will not fix an unclear offer, technical errors or a complicated purchasing process.

How a domain name affects the user’s decision

Conversion means completing a desired action, such as making a purchase, submitting a form or creating an account. A domain name is not usually the direct reason for that decision, but it can reduce or increase the uncertainty that arises before visiting a website and while completing a transaction.

Can a Domain Name Infringe a Trademark?

Tue, 26 May 2026 18:07:12 +0200

In brief: Yes, a domain name can infringe trademark rights, particularly when it is identical or similar to a protected brand and is used to offer similar products or mislead users. An address being available through a registrar does not mean it is safe to use. The risk depends, among other things, on the scope of trademark protection, how the domain is used and whether its owner has a legitimate interest in it.

Should an established project change its domain?

Mon, 25 May 2026 11:37:45 +0200

At a glance: A domain change makes sense when it solves a concrete business problem: a new brand, a more memorable name or an address with a damaged reputation. It is a technical and communications migration that can temporarily affect traffic, email and integrations. It is not a simple shortcut to better visibility.

When does a new domain offer a real benefit?

A change of brand, company name or business scope is a strong reason. A local shop expanding nationally may outgrow an address naming one city. Mergers, naming disputes or acquiring a shorter address matching the brand can also justify migration.

When Is a Premium Domain Worth the Cost?

Sat, 23 May 2026 06:38:33 +0200

In brief: A premium domain is worth the cost when buying it solves a specific business problem: it makes the brand easier to remember, reduces customer mistakes, or supports sales enough to justify the price. A short or attractive name alone does not guarantee traffic, high Google rankings, or business success. Before buying, compare the full cost of the domain with the realistic value it could deliver over the planned period of use.

Should you buy domains for future trends?

Wed, 20 May 2026 14:18:22 +0200

At a glance: Buying domains for future trends is high-risk speculation, not a reliable route to profit. Short, clear names that remain useful even if a trend develops differently have a stronger rationale. Before registering, investigate potential buyers, renewal costs and trademark conflicts.

What is a trend-based domain investment?

A trend domain is registered for an industry, product or behaviour that may become important. The investor does not acquire a business or a stake in a technology. They obtain registration rights for a paid period and hope someone will later buy them.

Common domain selection mistakes and how to avoid them

Sun, 17 May 2026 11:36:35 +0200

At a glance: A good domain is easy to say, write and associate with a brand, while avoiding conflicts with others’ rights. Check availability, history, renewals, similar names and email requirements before registration.

Choosing a name that is hard to remember

A domain need not describe everything the business does, but listeners should be able to reach it after hearing it in conversation, a podcast or an advert. Random abbreviations, multiple hyphens, ambiguous digits and alternative spellings create friction.

A Domain Name as a Digital Asset — A Comparison with Cryptoc and?

Fri, 08 May 2026 21:17:56 +0200

In brief: A domain name can be a digital asset because it has potential market value, can be transferred to another entity and can be used for business purposes. Unlike shares, however, it does not give you an ownership stake in a company or a right to its profits, and compared with cryptocurrencies, it is usually much less liquid and harder to value. Its value depends primarily on the usefulness of the specific name and finding the right buyer.

Why do some domains sell for tens of thousands of złoty?

Fri, 01 May 2026 14:22:02 +0200

At a glance: A domain may command tens of thousands of Polish złoty when it is memorable, practical and well suited to a commercial activity. Its price reflects what the name can be worth to a particular buyer, rather than the original registration fee. An asking price is only an expectation until a transaction confirms it.

An address whose value lies in the name

Registering an available domain grants use for the paid period. An aftermarket transaction transfers rights to a name already registered by someone else. An identical copy under the same extension cannot be created.

Which domains gain value, and which lose it?

Sat, 25 Apr 2026 09:25:14 +0200

At a glance: Short, memorable names useful to actual businesses have a stronger basis for retaining or gaining value. Unclear names, temporary trends, legal conflicts and a lack of plausible buyers weaken that case. An owner’s asking price does not establish market value.

What creates domain value?

A domain is useful when it identifies a business, product or service better than the alternatives. Both the quality of the name and the number of organisations that might need it matter.

Are domains still a good investment in 2026?

Sat, 18 Apr 2026 14:57:08 +0200

At a glance: Domains can be investments in 2026, but they are neither straightforward nor liquid assets. A small number of names solving a concrete business need may make sense at a price that allows several years of holding costs. Registering many random names can create renewal bills without creating a valuable portfolio.

What does domain investing involve?

An investor registers or buys a domain hoping to sell its registration rights for more. The name is not acquired forever: continued registration requires renewals under the registry’s and registrar’s rules. Check the extension’s terms, deadlines and fees before buying.

Building domain authority in AI-first search

Fri, 03 Apr 2026 11:40:00 +0200

At a glance: Authority in AI-assisted search is not a single score you can directly increase. It comes from a credible identity, useful content, verifiable information, coherent site structure and external recognition. Help search systems understand who you are, what you know and why your material is a useful source.

What does authority mean in AI-first search?

AI-first search may present a generated answer, comparison or recommendation alongside or instead of a list of links. A system must find relevant pages, understand them and select sources for its response.

Does an Exact Match Domain Still Make Sense?

Sat, 21 Mar 2026 11:05:00 +0100

In brief: An Exact Match Domain can still make sense if it precisely describes the offering, is easy to remember and does not restrict the company’s plans. However, matching a domain to a search phrase does not in itself ensure a high ranking in Google. For a project developed over many years, a recognisable brand, a good offering and a trustworthy website usually matter more.

What is an Exact Match Domain?

An Exact Match Domain, or EMD, is a domain that matches a specific phrase entered by users. Examples include butydobiegania.pl (Polish for “running shoes”) for a running shoe store, or wynajemkamperow.pl (“campervan rental”) for a company offering campervans for hire.

How Does a Domain Affect Visibility in Google AI Mode?

Sat, 14 Mar 2026 10:30:00 +0100

In brief: A domain affects visibility in Google AI Mode mainly indirectly: through the site’s crawlability and indexability, its reputation, brand consistency and fit with its target market. Simply including a keyword in the name or choosing a “trendy” extension does not guarantee that the site will appear or be cited as a source for an answer.

What visibility in Google AI Mode means

Google AI Mode generates a detailed answer to a user’s question and may point to materials worth using for further research. Visibility therefore does not necessarily mean a conventional position in a list of results. It can take the form of a link, a reference to a specific page or the use of a site in the search journey leading to an answer.

Brandable or generic domains for AI visibility?

Tue, 03 Mar 2026 10:00:00 +0100

At a glance: AI systems do not automatically prefer brandable or generic domains. A name can help people recognise a brand or topic, but content quality, technical accessibility, source reputation and relevance also matter. For a long-term project, a brandable name or a clear brand-and-category combination is often more flexible.

Brandable and generic domains

A brandable domain uses a distinctive company, product or service name, such as novaro.pl. It need not explain the business by itself, but can be memorable and distinguishable from competitors.

New Domain vs. Domain with a History — Which Should You Choose in

Sat, 21 Feb 2026 09:20:00 +0100

In brief: A new domain is usually the safer choice when you are building a brand from scratch and want full control over its reputation. A domain with a history may offer a better name, traffic from existing links or name recognition, but it requires a thorough audit. Domain age alone does not guarantee higher rankings in Google.

What a domain with a history really means

A domain with a history is an address that previously hosted a website or has already been registered, even if it is now available or listed for sale. It should not automatically be equated with a premium domain: the value of a premium domain may come primarily from a short, memorable name.

How to check a domain’s history before buying

Thu, 12 Feb 2026 08:20:00 +0100

At a glance: Check earlier use, registration history, technical reputation, backlinks and possible trademark conflicts before buying. A warning sign need not rule out a purchase, but significant discrepancies between the seller’s account and available evidence require explanation before payment.

Establish registration history and current status

Start with WHOIS or RDAP. Depending on the extension and privacy rules, these services provide status, registry or registrar information, nameservers and creation or expiry dates. Hidden personal details are not inherently suspicious.

Can a Domain Name with a Digit Look Professional?

Sat, 07 Feb 2026 07:10:00 +0100

In brief: A domain name with a digit can look professional if the number has a clear meaning for the brand, is easy to write down and does not need constant explanation. Problems begin when people do not know whether to use a digit or spell out the number, or see the number as a random addition to a name that is already taken.

When a digit strengthens a domain name

A digit works best when it is a natural part of the name of a company, product or service. It might represent a number of days, a device model, a product version, an area of operation or a specific brand promise. In that case, the domain does not feel like a fallback option, because the number serves an understandable purpose.

A hyphenated domain name: when is it a mistake, and when is it an

Wed, 04 Feb 2026 07:15:00 +0100

In brief: A hyphen in a domain name is not automatically a mistake, nor does it inherently rule out visibility in search results. It helps separate words and secure a readable address when the unhyphenated version is unavailable, but makes the name harder to dictate, remember and use for consistent branding. If you will often share the domain verbally, an address without a hyphen will usually be a better choice.

Domain length, SEO and click-through rates

Sat, 31 Jan 2026 10:30:00 +0100

At a glance: A shorter domain does not automatically rank higher in Google. It may be easier to remember, reduce typing mistakes and encourage clicks when it clearly communicates a brand or topic. Readability, credibility and audience fit matter more than character count alone.

Domain length and search rankings

Length is not a simple visibility switch. A five-character address will not outrank a longer one merely because it is shorter. Content quality and usefulness, backlinks, technical performance and relevance to the searcher’s intent all contribute.

How does Google interpret a domain name?

Thu, 29 Jan 2026 21:06:09 +0100

At a glance: Google can recognise words, brands and extensions in a domain, but the address alone does not determine rankings. A descriptive name can help people understand a topic, while visibility also depends on content, usefulness, reputation and technical operation.

A domain provides context

Google considers the domain as part of the wider website. A name may suggest a subject, brand or market, which is evaluated alongside page content, titles, incoming links and other context.

Fake Spotify email: how to spot it and what to do

Tue, 23 Dec 2025 20:20:00 +0100

In brief: Do not click a link or open an attachment in a suspicious message. Open Spotify yourself — through the app or by typing the address manually into your browser — and check your account, plan and payments there. If you entered your password or card details on a fake website, you need to change your login credentials quickly and contact your bank.

How a fake Spotify email works

This kind of message is usually a phishing attempt: an effort to steal information by impersonating a well-known company. Criminals may want to take over your Spotify account, obtain a password you also use on other services, or persuade you to enter your card details on a fake website.

What are premium domain names?

Tue, 16 Dec 2025 16:40:12 +0100

At a glance: A premium domain is an attractive internet address priced above an ordinary registration by its holder, registry or registrar. “Premium” is not a quality certificate: it can describe a valuable aftermarket name or a domain subject to special pricing. Check acquisition cost, renewal fees and rights to the name before buying.

What does premium mean?

Available standard domains can usually be registered at the provider’s ordinary rate. Premium names are priced differently because of their wording, length, meaning or registry rules.

What Is a Domain Name?

Sun, 07 Dec 2025 12:08:30 +0100

In brief: A domain name is a readable address you type into a browser, for example firma.pl. It replaces a server’s hard-to-remember IP address, but it is neither a website nor hosting. To launch a site, you need to register the domain, connect it to the appropriate service and renew it regularly.

How a domain name works

Computers communicating over the internet use IP addresses. A domain lets you use a human-readable name instead. DNS, the Domain Name System, connects it to the correct server — you can think of it as the internet’s address book.

Is a .com.pl domain a good choice?

Sun, 07 Dec 2025 12:08:30 +0100

At a glance: A .com.pl address can suit a business focused on Poland, especially when the matching .pl is unavailable. It is longer and can be confused with both .pl and .com, so check those addresses first. When all variants are available, .pl is usually simpler to communicate.

What is a .com.pl domain?

.com.pl belongs to the Polish .pl namespace. The “com” element historically suggests commercial activity but does not certify a company’s status or type of business. A company, organisation or individual can use it subject to the applicable registration terms.

Which Domain Should You Choose? A Guide to Extensions

Sat, 06 Dec 2025 12:30:00 +0100

In brief: choose your domain extension primarily based on the market you serve and how you want your audience to remember your brand. For a business targeting Poland, .pl is usually the natural choice; for an international project, .com or the relevant country’s extension. An unusual extension can complement a name well, but it should not make it harder to type or raise doubts about the website’s credibility.

What a domain extension actually means

An extension, also called a top-level domain or TLD, is the final part of an address, such as .pl in firma.pl. Country-code extensions such as .pl, .de and .cz are associated with a particular country. Generic extensions such as .com, .org and .net do not indicate a single country.

Why have your own domain name?

Fri, 05 Dec 2025 10:35:00 +0100

In brief: Your own domain gives you a permanent web address that is not tied to a particular hosting provider, website builder or social media platform. It makes it easier to build a recognisable brand, use professional email and move your website between providers. However, you need to renew the registration regularly and protect access to your registrant account.

A domain gives you control over your address

A domain is a readable name that points to online services, such as a website, shop or email. It is not the same as hosting: the domain serves as an address, while hosting provides the space and infrastructure needed to run the site.

Domain names with Polish characters

Fri, 05 Dec 2025 10:25:00 +0100

At a glance: Domains with Polish characters contain letters such as ą, ć, ę, ł, ń, ó, ś, ź and ż. They are internationalised domain names, or IDNs. They can suit Polish audiences, but you should check extension support, email compatibility and availability of the spelling without diacritics.

What is an IDN?

An Internationalized Domain Name contains characters beyond the basic Latin alphabet traditionally used in domain names. These may be Polish letters or characters used in languages such as German, Czech or Greek.

Can you have an email address in a domain with Polish characters?

Fri, 05 Dec 2025 10:15:00 +0100

In brief: Yes, the part of an address after the @ sign can contain Polish characters, for example biuro@żółw.pl, provided the IDN domain has been registered and the email provider supports it. However, this does not mean full compatibility with all forms, applications and email systems. The safest approach is to use such an address alongside an alias consisting only of ASCII characters.

What is a domain with Polish characters?

An IDN (Internationalized Domain Name) is an internet name containing characters outside the basic Latin alphabet, such as ą, ę, ł, ń, ó, ś, ź and ż. This allows users to see and type the name in its natural form, for example żółw.pl.